本文目錄一覽：
java中怎樣用post，get，put請求
java中用post，get，put請求方法：
public static String javaHttpGet(String url,String charSet){
String resultData = null;
try {
URL pathUrl = new URL(url); //創建一個URL對象
HttpURLConnection urlConnect = (HttpURLConnection) pathUrl.openConnection(); //打開一個HttpURLConnection連接
urlConnect.setConnectTimeout(30000); // 設置連接超時時間
urlConnect.connect();
if (urlConnect.getResponseCode() == 200) { //請求成功
resultData = readInputStream(urlConnect.getInputStream(), charSet);
}
} catch (MalformedURLException e) {
LogL.getInstance().getLog().error(“URL出錯！”, e);
} catch (IOException e) {
LogL.getInstance().getLog().error(“讀取數據流出錯！”, e);
}
return resultData;
}
public static String javaHttpPost(String url,MapString,Object map,String charSet){
String resultData=null;
StringBuffer params = new StringBuffer();
try {
IteratorEntryString, Object ir = map.entrySet().iterator();
while (ir.hasNext()) {
Map.EntryString, Object entry = (Map.EntryString, Object) ir.next();
params.append(URLEncoder.encode(entry.getKey(),charSet) + “=” + URLEncoder.encode(entry.getValue().toString(), charSet) + “”);
}
byte[] postData = params.deleteCharAt(params.length()).toString().getBytes();
URL pathUrl = new URL(url); //創建一個URL對象
HttpURLConnection urlConnect = (HttpURLConnection) pathUrl.openConnection();
urlConnect.setConnectTimeout(30000); // 設置連接超時時間
urlConnect.setDoOutput(true); //post請求必須設置允許輸出
urlConnect.setUseCaches(false); //post請求不能使用緩存
urlConnect.setRequestMethod(“POST”); //設置post方式請求
urlConnect.setInstanceFollowRedirects(true);
urlConnect.setRequestProperty(“Content-Type”,”application/x-www-form-urlencoded; charset=”+charSet);// 配置請求Content-Type
urlConnect.connect(); // 開始連接
DataOutputStream dos = new DataOutputStream(urlConnect.getOutputStream()); // 發送請求參數
dos.write(postData);
dos.flush();
dos.close();
if (urlConnect.getResponseCode() == 200) { //請求成功
resultData = readInputStream(urlConnect.getInputStream(),charSet);
}
} catch (MalformedURLException e) {
LogL.getInstance().getLog().error(“URL出錯！”, e);
} catch (IOException e) {
LogL.getInstance().getLog().error(“讀取數據流出錯！”, e);
} catch (Exception e) {
LogL.getInstance().getLog().error(“POST出錯！”, e);
}
return resultData;
}
如何在java中發送post請求
package com.test;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
public class D {
public static void main(String[] args){
ListNameValuePair nvps= new ArrayListNameValuePair();
nvps.add(new BasicNameValuePair(“id”, “1”));
String url=””;
HttpClient httpClient = null;
String response=””;
try {
HttpPost post = new HttpPost(url);
post.setHeader(“Connection”, “close”);
httpClient = new DefaultHttpClient();
post.setEntity(new UrlEncodedFormEntity(nvps));
HttpResponse httpres= httpClient.execute(post);
if (httpres.getStatusLine().getStatusCode() = 300) {
System.out.println(“Request Failed,Code:” + httpres.getStatusLine().getStatusCode() + “,URL:” + url);
}
response = EntityUtils.toString(httpres.getEntity(), “utf-8”);
}catch(Exception e){
e.printStackTrace();
}finally{
if(httpClient!=null){
httpClient.getConnectionManager().shutdown();
}
}
System.out.println(response);
}
}
需要httpclient-4.1.3.jar，httpcore-4.1.4.jar和commons-logging-1.1.1.jar
如何使用java 發送post請求
/**
* 向指定 URL 發送POST方法的請求
*
* @param url
* 發送請求的 URL
* @param param
* 請求參數，請求參數應該是 name1=value1name2=value2 的形式。
* @return 所代表遠程資源的響應結果
*/
public static String sendPost(String url, String param) {
PrintWriter out = null;
BufferedReader in = null;
String result = “”;
try {
URL realUrl = new URL(url);
// 打開和URL之間的連接
URLConnection conn = realUrl.openConnection();
// 設置通用的請求屬性
conn.setRequestProperty(“accept”, “*/*”);
conn.setRequestProperty(“connection”, “Keep-Alive”);
conn.setRequestProperty(“user-agent”,
“Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)”);
// 發送POST請求必須設置如下兩行
conn.setDoOutput(true);
conn.setDoInput(true);
// 獲取URLConnection對象對應的輸出流
out = new PrintWriter(conn.getOutputStream());
// 發送請求參數
out.print(param);
// flush輸出流的緩衝
out.flush();
// 定義BufferedReader輸入流來讀取URL的響應
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println(“發送 POST 請求出現異常！”+e);
e.printStackTrace();
}
//使用finally塊來關閉輸出流、輸入流
finally{
try{
if(out!=null){
out.close();
}
if(in!=null){
in.close();
}
}
catch(IOException ex){
ex.printStackTrace();
}
}
return result;
}
java HttpPost怎麼傳遞參數
public class HttpURLConnectionPost {
/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
readContentFromPost();
}
public static void readContentFromPost() throws IOException {
// Post請求的url，與get不同的是不需要帶參數
URL postUrl = new URL(“”);
// 打開連接
HttpURLConnection connection = (HttpURLConnection) postUrl.openConnection();
// 設置是否向connection輸出，因為這個是post請求，參數要放在
// http正文內，因此需要設為true
connection.setDoOutput(true);
// Read from the connection. Default is true.
connection.setDoInput(true);
// 默認是 GET方式
connection.setRequestMethod(“POST”);
// Post 請求不能使用緩存
connection.setUseCaches(false);
//設置本次連接是否自動重定向
connection.setInstanceFollowRedirects(true);
// 配置本次連接的Content-type，配置為application/x-www-form-urlencoded的
// 意思是正文是urlencoded編碼過的form參數
connection.setRequestProperty(“Content-Type”,”application/x-www-form-urlencoded”);
// 連接，從postUrl.openConnection()至此的配置必須要在connect之前完成，
// 要注意的是connection.getOutputStream會隱含的進行connect。
connection.connect();
DataOutputStream out = new DataOutputStream(connection
.getOutputStream());
// 正文，正文內容其實跟get的URL中 ‘? ‘後的參數字元串一致
String content = “欄位名=” + URLEncoder.encode(“字元串值”, “編碼”);
// DataOutputStream.writeBytes將字元串中的16位的unicode字元以8位的字元形式寫到流裡面
out.writeBytes(content);
//流用完記得關
out.flush();
out.close();
//獲取響應
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line;
while ((line = reader.readLine()) != null){
System.out.println(line);
}
reader.close();
//該乾的都幹完了,記得把連接斷了
connection.disconnect();
}
擴展資料：
關於Java HttpURLConnection使用
public static String sendPostValidate(String serviceUrl, String postData, String userName, String password){
PrintWriter out = null;
BufferedReader in = null;
String result = “”;
try {
log.info(“POST介面地址:”+serviceUrl);
URL realUrl = new URL(serviceUrl);
// 打開和URL之間的連接
URLConnection conn = realUrl.openConnection();
HttpURLConnection httpUrlConnection = (HttpURLConnection) conn;
// 設置通用的請求屬性
httpUrlConnection.setRequestProperty(“accept”,”*/*”);
httpUrlConnection.setRequestProperty(“connection”, “Keep-Alive”);
httpUrlConnection.setRequestProperty(“user-agent”,”Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)”);
httpUrlConnection.setRequestMethod(“POST”);
httpUrlConnection.setRequestProperty(“Content-Type”,”application/json;charset=UTF-8″);
Base64 base64 = new Base64();
String encoded = base64.encodeToString(new String(userName+ “:” +password).getBytes());
httpUrlConnection.setRequestProperty(“Authorization”, “Basic “+encoded);
// 發送POST請求必須設置如下兩行
httpUrlConnection.setDoOutput(true);
httpUrlConnection.setDoInput(true);
// 獲取URLConnection對象對應的輸出流
out = new PrintWriter(new OutputStreamWriter(httpUrlConnection.getOutputStream(),”utf-8″));
// 發送請求參數
out.print(postData);
out.flush();
// 定義BufferedReader輸入流來讀取URL的響應
in = new BufferedReader(new InputStreamReader(httpUrlConnection.getInputStream(),”utf-8″));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
//
// if (!””.equals(result)) {
// BASE64Decoder decoder = new BASE64Decoder();
// try {
// byte[] b = decoder.decodeBuffer(result);
// result = new String(b, “utf-8”);
// } catch (Exception e) {
// e.printStackTrace();
// }
// }
return result;
} catch (Exception e) {
log.info(“調用異常”,e);
throw new RuntimeException(e);
}
//使用finally塊來關閉輸出流、輸入流
finally{
try{
if(out!=null){
out.close();
}
if(in!=null){
in.close();
}
}
catch(IOException e){
log.info(“關閉流異常”,e);
}
}
}
}
原創文章，作者：小藍，如若轉載，請註明出處：https://www.506064.com/zh-tw/n/151623.html
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