java httpurlconnection 设置编码

一、参考资料

为什么要把参考资料放在前面，主要是方便大家资料阅读。

简单介绍Java网络编程中的HTTP请求

http://www.jb51.net/article/72651.htm

HttpURLConnection用法详解

http://www.cnblogs.com/guodongli/archive/2011/04/05/2005930.html

http://0411.iteye.com/blog/1068297

关于setConnectTimeout和setReadTimeout的问题

http://blog.csdn.net/jackson_wen/article/details/51923514

HTTP协议头部与Keep-Alive模式详解

http://blog.csdn.net/charleslei/article/details/50621912

HttpURLConnection与HttpClient 区别、联系、性能对比

http://blog.csdn.net/u011479540/article/details/51918474

http://blog.csdn.net/zhou_wenchong/article/details/51243079

http://www.cnblogs.com/liushuibufu/p/4140913.html

http://blog.csdn.net/wszxl492719760/article/details/8522714

其他

http://blog.csdn.net/u012228718/article/details/42028951

http://www.jb51.net/article/73621.htm

http://blog.csdn.net/u012228718/article/details/42028951

http://blog.csdn.net/u011192000/article/details/47358933

二、HttpURLConnection用法 代码

1、UserInfo    rest服务器类，前一篇文章讲解了如何搭建rest服务

2、HttpTools   http工具类，实现了doget与dopost方法

3、TestRest    测试类

以下代码已经测试通过。

UserInfo.java

package com.myrest;

import java.io.UnsupportedEncodingException;

import java.net.URLDecoder;

import javax.ws.rs.GET;

import javax.ws.rs.POST;

import javax.ws.rs.Path;

import javax.ws.rs.PathParam;

import javax.ws.rs.Produces;

import javax.ws.rs.core.MediaType;

// 这里@Path定义了类的层次路径。

// 指定了资源类提供服务的URI路径。

@Path("UserInfoService")

public class UserInfo {

// @GET表示方法会处理HTTP GET请求

@GET

// 这里@Path定义了类的层次路径。指定了资源类提供服务的URI路径。

@Path("/name/{i}")

// @Produces定义了资源类方法会生成的媒体类型。

@Produces(MediaType.TEXT_XML)

// @PathParam向@Path定义的表达式注入URI参数值。

public String userName(@PathParam("i") String i) {

// 发现get提交，会帮我们自动解码

System.out.println("传入 name：" + i);

String name = "返回name：" + i;

return name;

}

@POST

@Path("/information/")

public String userAge(String info) throws UnsupportedEncodingException {

// post提交需要我们手动解码，避免中文乱码

String str = URLDecoder.decode(info, "UTF-8");

System.out.println("传入参数： " + info);

System.out.println("解码后参数： " + str);

String value = "返回值：" + str;

return value;

}

}

HttpTools.java

package com.util;

import java.io.BufferedReader;

import java.io.ByteArrayOutputStream;

import java.io.DataOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLEncoder;

import java.util.Map;

public  final class HttpTools {

private static final int CONNECT_TIMEOUT = 50000;

private static final int READ_TIMEOUT = 30000;

public static String doGet(String urlPath){

String ret=null;

if(urlPath!=null){

HttpURLConnection httpConn = null;

try {

// 建立连接

URL url = new URL(urlPath);

httpConn = (HttpURLConnection) url.openConnection();

// 设置参数

//httpConn.setDoOutput(true); // 需要输出

httpConn.setDoInput(true); // 需要输入

httpConn.setUseCaches(false); // 不允许缓存

httpConn.setRequestMethod("GET"); // 设置POST方式连接

// 设置请求属性

//                httpConn.setRequestProperty("Content-Type", "application/x-java-serrialized-object");

//设置请求体的类型是文本类型

httpConn.setRequestProperty("Content-Type", "pplication/x-www-form-urlencoded");

//维持长连接，这里要注意，高并发不知道是否有bug

httpConn.setRequestProperty("Connection", "Keep-Alive");

httpConn.setRequestProperty("Charset", "UTF-8");

//设置超时

httpConn.setConnectTimeout(CONNECT_TIMEOUT); //连接超时时间

httpConn.setReadTimeout(READ_TIMEOUT);    //传递数据的超时时间

// 获得响应状态

int resultCode = httpConn.getResponseCode();

if (HttpURLConnection.HTTP_OK == resultCode) {

InputStream inputStream=httpConn.getInputStream();

//处理返回结果

ret=dealResponseResult(inputStream);

}

} catch (Exception e) {

e.printStackTrace();

}

}

return ret;

}

public static String doPost(String urlPath,Map params, String encode){

String ret=null;

byte[] data = getRequestData(params, encode).toString().getBytes();//获得请求体

try {

// 建立连接

URL url = new URL(urlPath);

HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();

// 设置参数

httpConn.setDoOutput(true); // 需要输出

httpConn.setDoInput(true); // 需要输入

httpConn.setUseCaches(false); // 不允许缓存

httpConn.setRequestMethod("POST"); // 设置POST方式连接

// 设置请求属性

//            httpConn.setRequestProperty("Content-Type", "application/x-java-serrialized-object");

//设置请求体的类型是文本类型

httpConn.setRequestProperty("Content-Type", "pplication/x-www-form-urlencoded");

//设置请求体的长度,可以不需要

httpConn.setRequestProperty("Content-Length", String.valueOf(data.length));

//维持长连接，这里要注意，高并发不知道是否有bug

httpConn.setRequestProperty("Connection", "Keep-Alive");

httpConn.setRequestProperty("Charset", encode);

//设置超时

httpConn.setConnectTimeout(CONNECT_TIMEOUT); //连接超时时间

httpConn.setReadTimeout(READ_TIMEOUT);    //传递数据的超时时间

// 连接,也可以不用明文connect，使用下面的httpConn.getOutputStream()会自动connect

//httpConn.connect();

// 建立输入流，向指向的URL传入参数

DataOutputStream dos = new DataOutputStream(httpConn.getOutputStream());

dos.write(data);

dos.flush();

dos.close();

// 获得响应状态

int resultCode = httpConn.getResponseCode();

if (HttpURLConnection.HTTP_OK == resultCode) {

InputStream inputStream=httpConn.getInputStream();

//处理返回结果

ret=dealResponseResult(inputStream);

}

} catch (Exception e) {

e.printStackTrace();

return "err: " + e.getMessage().toString();

}

return ret;

}

public static StringBuffer getRequestData(Map params, String encode) {

StringBuffer stringBuffer = new StringBuffer();        //存储封装好的请求体信息

try {

for(Map.Entry entry : params.entrySet()) {

stringBuffer.append(entry.getKey())

.append("=")

.append(URLEncoder.encode(entry.getValue(), encode))

.append("&");

}

stringBuffer.deleteCharAt(stringBuffer.length() - 1);    //删除最后的一个"&"

} catch (Exception e) {

e.printStackTrace();

}

return stringBuffer;

}

public static String dealResponseResult(InputStream inputStream) {

String value = null;

try {

//存储处理结果

StringBuffer sb = new StringBuffer();

String readLine = new String();

BufferedReader responseReader = new BufferedReader(

new InputStreamReader(inputStream, "UTF-8"));

while ((readLine = responseReader.readLine()) != null) {

sb.append(readLine).append("n");

}

responseReader.close();

value=sb.toString();

} catch (Exception e) {

e.printStackTrace();

}

return value;

}

}

TestRest.java

package com.myrest;

import java.io.BufferedReader;

import java.io.DataOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.UnsupportedEncodingException;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLEncoder;

import java.util.HashMap;

import java.util.Map;

import com.util.HttpTools;

public class TestRest {

public static void main(String[] args) throws IOException {

testGet();

testPost();

}

public static void testGet() throws IOException {

String BASE_URI = "http://localhost:8080/webtest";

String PATH_NAME = "/rest/UserInfoService/name/";

String tmp = "奥特曼1号";

// 汉字必须URL编码，否则报错。这里用URLEncoder编码，rest服务需要用URLDecoder解码

String name = URLEncoder.encode(tmp, "UTF-8");

String urlPath = BASE_URI + PATH_NAME + name;

String ret=HttpTools.doGet(urlPath);

System.out.println(ret);

}

public static void testPost() throws IOException {

String BASE_URI = "http://localhost:8080/webtest";

String PATH_NAME = "/rest/UserInfoService/information/";

String urlPath = BASE_URI + PATH_NAME;

Map params=new HashMap();

params.put("myParam", "我爱我的祖国！");

String ret =HttpTools.doPost(urlPath, params, "utf-8");

System.out.println(ret);

}

}