包含jsp与java通讯的词条

本文目录一览：

• 1、jsp，java串口通信的问题
• 2、jsp和Java后台数据如何交互
• 3、java开发的信息系统里，jsp与java文件是怎么传递数据的啊？
• 4、spring 中如何实现jsp与java的交互
• 5、jsp与java文件怎么传递数据？

jsp，java串口通信的问题

可以,使用comm,jar

class SerialExample {

public static void main(String[] args) {

//TO DO: Add your JAVA codes here

long curTime = System.currentTimeMillis();

long serialtime = 8000;

boolean state = true;

SerialBean SB = new SerialBean(2);//设置端口号2

String Msg = “AD 01 0D”;//发送命令

SB.Initialize(9600);//设置波率

SB.WritePort(Msg);//发送命令

/* for (int i = 5; i 10; i++) {

System.out.println( SB.ReadPort(3));//设置读取个数

}

*/

String readdata = SB.ReadPort(“0D”,4000);//读取以OD结束的数据,4000ms没有数据就返回空

if (readdata.length() 0) { //System.out.println(readdata.length());//如果有读到数据

System.out.println(readdata);//如果有读到数据

}

while (readdata.length() 1 state) {//如果没有读到数据

readdata = SB.ReadPort(“0D”,4000);

System.out.println(readdata);

if (System.currentTimeMillis() – curTime serialtime) {

state = false;//设置读取错误超时

}

System.out.println(“readdaa:” + state);

System.out.println(System.currentTimeMillis() – curTime);

}

if (!state) {

System.out.println(“数据读取超时”);

}

SB.ClosePort();//关闭连接

}

}

public class SerialBuffer {

Convents cv = new Convents();

private String Content = “”;

private String CurrentMsg, TempContent;

private boolean available = false;

private int LengthNeeded = 1;

String str = “”;

byte b;

/**

*

* This function returns a string with a certain length from the incoming

* messages.

*

* @param Length The length of the string to be returned.

*

*/

public synchronized String GetMsg(int Length) {

LengthNeeded = Length;

long timeout=2000;

long curtime=System.currentTimeMillis();

notifyAll();

if (LengthNeeded Content.length()) {

available = false;

while (available == false) {

try {

if(System.currentTimeMillis()-curtimetimeout) wait();

} catch (InterruptedException e) {

}

}

}

CurrentMsg = Content.substring(0, LengthNeeded);

TempContent = Content.substring(LengthNeeded);

Content = TempContent;

LengthNeeded = 1;

notifyAll();

return CurrentMsg;

}

public synchronized String GetMsg(String endstring,long timeout) {

LengthNeeded =Content.indexOf(endstring);

notifyAll();

if (LengthNeeded 0) {

available = false;

while (available == false) {

try {

wait(timeout);

available=true;

} catch (InterruptedException e) {

}

}

return “”;

}

if (LengthNeeded 0) {

CurrentMsg = Content.substring(0, LengthNeeded+endstring.length());

TempContent = Content.substring(LengthNeeded+endstring.length());

Content = TempContent;

}

LengthNeeded = -1;

notifyAll();

return CurrentMsg;

}

public synchronized void PutChar(int c) {

Content = Content.concat(cv.byteToHexString(c));

if (LengthNeeded Content.length() Content.length() 0) {

available = true;

}

notifyAll();

}

}

/*

* To change this template, choose Tools | Templates

* and open the template in the editor.

*/

package common.serial;

/**

*

* @author Jason

*/

import java.io.*;

import java.util.*;

import javax.comm.*;

import common.code.Convents;

public class SerialBean {

Convents cv=new Convents();

String PortName = “”;

CommPortIdentifier portId = null;

SerialPort serialPort = null;

OutputStream out;

InputStream in;

SerialBuffer SB;

ReadSerial RT;

int rate=9600;

String endstring =””;

long timeout=2000;

public SerialBean(int PortID) {

PortName = “COM” + PortID;

}

public int Initialize(int rate) {

int InitSuccess = 1;

int InitFail = -1;

try {

portId = CommPortIdentifier.getPortIdentifier(PortName);

try {

serialPort = (SerialPort) portId.open(“Serial_Communication”, 2000);

} catch (PortInUseException e) {

return InitFail;

}

//Use InputStream in to read from the serial port, and OutputStream

//out to write to the serial port.

try {

in = serialPort.getInputStream();

out = serialPort.getOutputStream();

} catch (IOException e) {

return InitFail;

}

//Initialize the communication parameters to 9600, 8, 1, none.

try {

serialPort.setSerialPortParams(rate,

SerialPort.DATABITS_8,

SerialPort.STOPBITS_1,

SerialPort.PARITY_NONE);

} catch (UnsupportedCommOperationException e) {

return InitFail;

}

} catch (NoSuchPortException e) {

return InitFail;

}

SB = new SerialBuffer();

RT = new ReadSerial(SB, in);

RT.start();

return InitSuccess;

}

public String ReadPort(int Length) {

String Msg;

Msg = SB.GetMsg(Length);

return Msg;

}

public String ReadPort(String endstring,long timeout) {

String Msg;

Msg = SB.GetMsg(endstring,timeout);

return Msg;

}

public void WritePort(String Msg) {

try {

out.write(cv.hexStringToByte(Msg));

} catch (IOException e) {

}

}

public void ClosePort() {

serialPort.close();

}

}

package common.serial;

import java.io.*;

public class ReadSerial extends Thread {

private SerialBuffer ComBuffer;

private InputStream ComPort;

char[] ch;

public ReadSerial(SerialBuffer SB, InputStream Port) {

ComBuffer = SB;

ComPort = Port;

}

@Override

public void run() {

int c;

try {

while (true) {

c=ComPort.read();

ComBuffer.PutChar(c);

}

} catch (IOException e) {

}

}

}

/*

* To change this template, choose Tools | Templates

* and open the template in the editor.

*/

package common.serial;

/**

*

* @author Administrator

*/

public class PortOpreate {

private String sendtxt=””;

private String recivetxt=””;

private int comid = 1;

private int comrate = 9600;

private int timeout = 4000;

private long waittime = 13000;

private String endtxt = “0D”;

private boolean pstate=false;

private String massage=””;

public void PortOpreate(boolean hasreturn) {

long curTime = System.currentTimeMillis();

long serialtime = getWaittime();

boolean state = true;

int t=0;

SerialBean SB = new SerialBean(getComid());//设置端口号2

t=SB.Initialize(getComrate());//设置波率

if(t0){

SB.WritePort(getSendtxt());//发送命令

if (hasreturn) {

String readdata = SB.ReadPort(getEndtxt(), getTimeout());//读取以OD结束的数据,4000ms没有数据就返回空

if (readdata.length() 0) { //System.out.println(readdata.length());//如果有读到数据

System.out.println(readdata);//如果有读到数据

}

while (readdata.length() 1 state) {//如果没有读到数据

readdata = SB.ReadPort(getEndtxt(), getTimeout());

System.out.println(readdata);

if (System.currentTimeMillis() – curTime serialtime) {

state = false;//设置读取错误超时

}

System.out.println(“readdaa:” + state);

System.out.println(System.currentTimeMillis() – curTime);

}

if (!state) {

System.out.println(“数据读取超时”);

setMassage(“数据读取超时”);

}

setRecivetxt(readdata);

setPstate(state);

}

SB.ClosePort();//关闭连接

}else{

System.out.println(“端口号出现错误”);

setMassage(“端口号出现错误”);

}

}

/**

* @return the sendtxt

*/

public String getSendtxt() {

return sendtxt;

}

/**

* @param sendtxt the sendtxt to set

*/

public void setSendtxt(String sendtxt) {

this.sendtxt = sendtxt;

}

/**

* @return the recivetxt

*/

public String getRecivetxt() {

return recivetxt;

}

/**

* @param recivetxt the recivetxt to set

*/

public void setRecivetxt(String recivetxt) {

this.recivetxt = recivetxt;

}

/**

* @return the comid

*/

public int getComid() {

return comid;

}

public void setComid(int comid) {

this.comid = comid;

}

public int getComrate() {

return comrate;

}

public void setComrate(int comrate) {

this.comrate = comrate;

}

public int getTimeout() {

return timeout;

}

public void setTimeout(int timeout) {

this.timeout = timeout;

}

public long getWaittime() {

return waittime;

}

public void setWaittime(long waittime) {

this.waittime = waittime;

}

public String getEndtxt() {

return endtxt;

}

public void setEndtxt(String endtxt) {

this.endtxt = endtxt;

}

public boolean isPstate() {

return pstate;

}

public void setPstate(boolean pstate) {

this.pstate = pstate;

}

public String getMassage() {

return massage;

}

public void setMassage(String massage) {

this.massage = massage;

}

}

package common.serial;

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

public class PortOperatorServlet extends HttpServlet {

protected void processRequest(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType(“text/html;charset=UTF-8”);

PrintWriter out = response.getWriter();

try {

long curTime = System.currentTimeMillis();

long serialtime = 8000;

boolean state = true;

String Msg = “AD 01 0D”;//发送命令

SerialBean SB = new SerialBean(10);//设置端口号2

SB.Initialize(9600);//设置波率

SB.WritePort(Msg);//发送命令

/* for (int i = 5; i 10; i++) {

System.out.println( SB.ReadPort(3));//设置读取个数

}

*/

String readdata = SB.ReadPort(“0D”,4000);//读取以OD结束的数据

if (readdata.length() 0) { //System.out.println(readdata.length());//如果有读到数据

System.out.println(readdata);//如果有读到数据

}

while (readdata.length() 1 state) {//如果没有读到数据

readdata = SB.ReadPort(“0D”,4000);

System.out.println(readdata);

out.println(readdata);

if (System.currentTimeMillis() – curTime serialtime) {

state = false;//设置读取错误超时

}

System.out.println(“readdaa:” + state);

System.out.println(System.currentTimeMillis() – curTime);

}

if (!state) {

System.out.println(“数据读取超时”);

out.println(“数据读取超时”);

}

SB.ClosePort();//关闭连接

} finally {

out.close();

}

}

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

processRequest(request, response);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

processRequest(request, response);

}

public String getServletInfo() {

return “Short description”;

}

}

package common.code;

public final class Convents {

public final static char[] BToA = “0123456789abcdef”.toCharArray();

/**

* 把16进制字符串转换成字节数组A1 01 0D

* @param hex

* @return

*/

public byte[] hexStringToByte(String hex) {

String str[] = hex.split(” “);

int len = str.length;

byte[] result = new byte[len];

char[] achar = hex.toCharArray();

for (int i = 0; i len; i++) {

result[i] = (byte) (toByte(str[i].charAt(0)) * 16 + toByte(str[i].charAt(1)));

}

return result;

}

private static byte toByte(char c) {

byte b = (byte) (“0123456789ABCDEF”.indexOf(c));

return b;

}

/**

* 把字节数组转换成16进制字符串

* @param bArray

* @return

*/

public String byteToHexString(int b){

String st=””;

st=Integer.toHexString(b);

if (st.length() 2) {

st=”0″+Integer.toHexString(b).toUpperCase()+” “;

} else {

st=Integer.toHexString(b).toUpperCase()+” “;

}

return st;

}

public String bytesToHexString(byte[] bArray) {

StringBuffer sb = new StringBuffer(bArray.length);

String sTemp;

for (int i = 0; i bArray.length; i++) {

sTemp = Integer.toHexString(bArray[i]).toUpperCase();

}

return sb.toString();

}

}

jsp和Java后台数据如何交互

%

String path = request.getContextPath();

%

获取jsp所在工程的名称

var ids = new Array();

$.ajax({

type : “POST”,

contentType : ‘application/json’,

url : ‘%=path%/ui/product/havePsmPackage’,

data:JSON.stringify(ids),

async :false,

dataType : “json”,

success : function(data) {

},

error:function(){

}

});

1、前台如果传的是一个集合，后台可以使用参数 @RequestBody ListString ids 来接收

2、如果前台是这种传值方式 data:{“name”:name,”id”:id},

那后台可以通过创建一个字段名称对应的实体类来接收

或者使用String name = request.getParameter(“name”)的方式来接收

3、如果ajax选择的GET方法，那后台方法的字段名称和url的入参名称保持一致就能接收到数据了

4、window.location.href=”%=path%/ui/psmpackage/toPsmPackageList”;

这是跳转到新页面的方法

@RequestMapping(value = “/toPsmPackageList”)

public String toPsmPackageList(HttpServletRequest request) {

return “psmPackage/psmPackageList”;

}

这是后台的接受方式，返回的是对应jsp的文件夹和文件名

页面跳转的方法不需要@ResponseBody注解，而获取返回值的方法则一定要加，不然获取不到返回值

5、window.open(url); 可以在浏览器上新开一个页面。对应的是window.close();

6、如何将数据带到新增的页面

第一：第一个页面通过

window.location.href=”%=path%/ui/product/condition?lineCode=”+lineCode+”typeCode=”+typeCode;传值

在新页面可以通过var lineCode = ‘%=(String)request.getParameter(“lineCode”)%’这种方式来取值

第二：后台代码这样处理request.setAttribute(“product”, result);

input name=”id” type=”text” value=”${product.id}” /

${}来取值。

java开发的信息系统里，jsp与java文件是怎么传递数据的啊？

jsp与java文件传递数据可以使用Servlet类来传递，jsp将数据存入到request对象中，Servlet类获取这个request对象，并将数据取出。

示例代码如下：

JSP代码：%@ page language=”java” import=”java.util.*” pageEncoding=”UTF-8″%

!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”

html

  head

    titleDemo/title

  /head

  body

      form action=”/demoServlet” method=”post”

          input type=”text” name=”name”/

          input type=”submit” value=”提交”/

      /form

  /body

/html

Servlet代码：

public class DemoServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        String name = request.getParameter(“name”);//获取jsp页面输入的参数

        System.out.println(name);

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        doGet(request, response);

    }

}

表单提交之后，调用Servlet类的方法，通过request对象获取jsp页面传入的参数值，实现数据的传递。

spring 中如何实现jsp与java的交互

spring中利用mvc框架就可以实现jsp和java交互了。

以下用spring mvc输出hello world为例来说明：

一、项目依赖的jar包：

1.Spring框架依赖的jar包：

日志：commons-logging-1.1.3.jar；

JSTL支持：jakarta-taglibs-standard-1.1.2中的jstl.jar和standard.jar；

2.Spring的jar包：

spring-framework-3.2.5.RELEASE/libs中的jar包（这里为了方便我直接把全部都复制过去了）；

把以上的jar包全部复制到项目的WebContent/WEB-INF/lib目录中。

二、在/WEB-INF中添加web.xml文件，文件内容如下：

?xml version=”1.0″ encoding=”UTF-8″?

web-app xmlns:xsi=”” xmlns=”” xmlns:web=”” xsi:schemaLocation=” ” id=”WebApp_ID” version=”3.0″

 display-nameSpringMVCLesson/display-name

       

   servlet

       servlet-nameSpringMVCLesson/servlet-name

       servlet-classorg.springframework.web.servlet.DispatcherServlet/servlet-class

       init-param

           param-namecontextConfigLocation/param-name

           param-valueclasspath:springservlet-config.xml/param-value

       /init-param

       load-on-startup1/load-on-startup!– load-on-startup必须放在最后 —

   /servlet

   !– Spring MVC配置文件结束 —

   

   servlet-mapping

       servlet-nameSpringMVCLesson/servlet-name

       url-pattern//url-pattern

   /servlet-mapping

/web-app

三、springservlet-config.xml文件配置：

在项目中新建一个resources的Source Folder文件夹，并添加springservlet-config.xml文件。

?xml version=”1.0″ encoding=”UTF-8″?

beans xmlns=””

 xmlns:xsi=””

 xmlns:p=””

 xmlns:context=””

 xmlns:util=””

 xmlns:mvc=””

 xsi:schemaLocation=”

 

 

 

 

 

 

 

 ”

   

   !– 默认的注解映射的支持 —  

   mvc:annotation-driven/

     

   !– 如果当前请求为“/”时，则转发到“/helloworld/index” —

   mvc:view-controller path=”/” view-name=”forward:/helloworld/index”/

   !– 静态资源映射 —

   mvc:resources mapping=”/js/**” location=”/WEB-INF/js/” /

   mvc:resources mapping=”/css/**” location=”/WEB-INF/css/” /

   mvc:resources mapping=”/fonts/**” location=”/WEB-INF/fonts/” /

   mvc:resources mapping=”/plugins/**” location=”/WEB-INF/plugins/” /

   mvc:resources mapping=”images/**” location=”/WEB-INF/images/” /

   !– 当上面要访问的静态资源不包括在上面的配置中时，则根据此配置来访问 —

   mvc:default-servlet-handler/

   !– 开启controller注解支持 —

   !– use-default-filters=”false” 只扫描指定的注解 —

   context:component-scan base-package=”com.demo.web.controllers” use-default-filters=”false”

       context:include-filter type=”annotation” expression=”org.springframework.stereotype.Controller”/

   /context:component-scan

     

   !– 视图解析器 —

   bean class=”org.springframework.web.servlet.view.InternalResourceViewResolver”

      property name=”viewClass” value=”org.springframework.web.servlet.view.JstlView”/

      property name=”contentType” value=”text/html”/        

      property name=”prefix” value=”/WEB-INF/views/”/

      property name=”suffix” value=”.jsp”/

   /bean

   

/beans

mvc:annotation-driven/ 开启注解映射支持，它是为了简化配置的缩写形式，它相当于以下2个配置：

bean class=”org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping”/

bean class=”org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter”/

由于我们在web.xml文件里面配置的是拦截所有的请求到该servlet，所以我们在这里要对静态资源文件映射作一下配置，否则请求这些资源文件会返回404：

!– 静态资源映射 —

mvc:resources mapping=”/js/**” location=”/WEB-INF/js/” /

mvc:resources mapping=”/css/**” location=”/WEB-INF/css/” /

mvc:resources mapping=”/fonts/**” location=”/WEB-INF/fonts/” /

mvc:resources mapping=”/plugins/**” location=”/WEB-INF/plugins/” /

mvc:resources mapping=”images/**” location=”/WEB-INF/images/” /

!– 当上面要访问的静态资源不包括在上面的配置中时，则根据此配置来访问 —

mvc:default-servlet-handler/

开启Controller注解支持，并配置只扫描指定包下面的Controller：

context:component-scan base-package=”com.demo.web.controllers” use-default-filters=”false”

   context:include-filter type=”annotation” expression=”org.springframework.stereotype.Controller”/

/context:component-scan

配置视图解析器，并指定视图所在的文件夹：

bean class=”org.springframework.web.servlet.view.InternalResourceViewResolver”

  property name=”viewClass” value=”org.springframework.web.servlet.view.JstlView”/

  property name=”contentType” value=”text/html”/        

  property name=”prefix” value=”/WEB-INF/views/”/

  property name=”suffix” value=”.jsp”/

/bean

添加HelloWorldController，在项目中新建一个web的Source Folder文件夹，并在文件夹下面添加com.demo.web.controllers包，在包中添加一个HelloWorldController类，类中内容如下：

package com.demo.web.controllers;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.servlet.ModelAndView;

@Controller

@RequestMapping(value = “/helloworld”)

public class HelloWorldController {

   @RequestMapping(value=”/index”, method = {RequestMethod.GET})

   public ModelAndView index(){

       

       ModelAndView modelAndView = new ModelAndView();  

       modelAndView.addObject(“message”, “Hello World!”);  

       modelAndView.setViewName(“index”);  

       return modelAndView;

   }

   

}

其中@Controller 注解把该class指定为controller，controller 上的@RequestMapping 注解的 value值指定该controller所映射的请求。

方法上的@RequestMapping 注解指定该方法为一个action，value 值指定该action所映射的请求，method 中的RequestMethod.GET指定该action只接受get请求。

ModelAndView 中的setViewName指定了该action所对应的视图名称，解析视图时会在springservlet-config.xml文件指定的视图文件夹中寻找对应的视图。

添加视图，在项目/WEB-INF文件夹下新建一个views文件夹，并在views中添加index.jsp视图，视图内容如下：

%@ page language=”java” contentType=”text/html; charset=UTF-8″

   pageEncoding=”UTF-8″%

!DOCTYPE html PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN” “”

html

head

meta http-equiv=”Content-Type” content=”text/html; charset=UTF-8″

titleInsert title here/title

/head

body

   ${message}

/body

/html

运行项目输出结果：

jsp与java文件怎么传递数据？

可以使用Servlet类来传递

返回一个RequestDispatcher对象

该对象的forward()方法用于转发请求

RequestDispatcher getRequestDispatcher(String path)

例如:request.getRequestDispatcher(“url”),forward(request,response);

设置追加请求中所需的属性参数

Void setAttribute(“属性名”,”属性值”)

例如:request,setAttribute(“username”,”administrator”);

用于获取请求中携带的属性参数

Object getAttribute(“属性名”)

例如:String usernam=(String)request.getAttribute(“username”);

响应对象response方法:response.sendRedirect(“url”);

用于充定向一个新的URL地址

经常配合使用session会话对象进行所需属性参数的传递

例如:session,setAttribute(“username”,”administrator”);

session.serAttribute(“password”,”123456”);

…

If()username!=null{

Out.println(“欢迎你:”+username.toString()

}

2.转发和重定向的区别

分别从5个点进行划分区别

(1)URl变化:转发不会发生变化,重定向会改变地址栏的URL

(2)重新发出请求:转发不会,从头至尾只有一次请求,重定向会发起两次请求

(3)是否携带请求:转发会携带request相关信息,重定向不会携带,所以会丢失

(4)目标URl要求:转发只能跳转WEB项目下的目标文件,重定向可跳转任意URL

(5)行为区别:转发时服务器端的行为,重定向时客户端行为

3.四中常用的跳转方式

(1)后台发起转发请求

request.getRequestDispatcher(“index.jsp”).forward(request,response);

(2)后台发起重定向

Response.sendRedirect(“indec.jsp”);

!–3.jsp标签跳转 相当于前端的转发–

jsp:forward page=”index.jsp”

jsp:param value=”admin” name=”user name”

jsp:param value=”123456” name=”password”

/jsp:forward

!–4.超链接跳转 get请求方式跳转页面 类似于前段的重定向–

a href=”index.jsp?username=adminadminpassword=123456”跳转index.jsp/a