AJAX 跨域调用和 Java 跨域 发送请求

AJAX 跨域调用

前台代码：

Html代码  

<script type="text/javascript" src="jquery-1.7.2.min.js">script>
<script type="text/javascript">
    function RegisterRequest2() {
        /* getJSON method is ok also...
        $.getJSON("http://192.168.1.154:7087/ClusterServer/Rigister?jsoncallback=?", { pwd: '123', username: 'tl' }, function(json) { alert(json.name); });
        */

        $.ajax({
            url: "http://192.168.1.154:7087/ClusterServer/Rigister?jsoncallback=?",
            type: "GET",
            data: { pwd: '123', username: 'tl' },
            dataType: "jsonp",
            success: function(data) {
                alert(data.name);
            },
            error: function(a, b, c) {
                alert("error==" + b);
            }

        });
    }
script>
<input type="button" onclick="RegisterRequest2();"  value="StartRequest" />

 

后台Servlet代码：

Java代码  

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Rigister extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        String pwd = req.getParameter("pwd");
        String username =req.getParameter("username");
        System.out.println("get=="+username+"  ==="+pwd);

        String callback = req.getParameter("jsoncallback");
        resp.getWriter().write(callback + "({name:'tzy',phone:'123'})"); //参数为json格式
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        String pwd = req.getParameter("pwd");
        String username =req.getParameter("username");
        System.out.println("post=="+username+"  ==="+pwd);

        String callback = req.getParameter("jsoncallback");
        resp.getWriter().write(callback + "({name:'tzy',phone:'123'})");
    }

}

转载：http://tonl.iteye.com/blog/1682394

Java 跨域 发送请求

package com.nicchagil.httprequestdemo;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLConnection;public class HttpPostRequest {    /**
     * Main
     * @param args
     * @throws Exception 
     */
    public static void main(String[] args) throws Exception {
        System.out.println(doPost());
    }    
    /**
     * Post Request
     * @return
     * @throws Exception     */
    public static String doPost() throws Exception {
        String parameterData = "username=nickhuang&blog=http://www.cnblogs.com/nick-huang/";
        
        URL localURL = new URL("http://localhost:8080/OneHttpServer/");
        URLConnection connection = localURL.openConnection();
        HttpURLConnection httpURLConnection = (HttpURLConnection)connection;
        
        httpURLConnection.setDoOutput(true);
        httpURLConnection.setRequestMethod("POST");
        httpURLConnection.setRequestProperty("Accept-Charset", "utf-8");
        httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        httpURLConnection.setRequestProperty("Content-Length", String.valueOf(parameterData.length()));
        
        OutputStream outputStream = null;
        OutputStreamWriter outputStreamWriter = null;
        InputStream inputStream = null;
        InputStreamReader inputStreamReader = null;
        BufferedReader reader = null;
        StringBuffer resultBuffer = new StringBuffer();
        String tempLine = null;        
        try {
            outputStream = httpURLConnection.getOutputStream();
            outputStreamWriter = new OutputStreamWriter(outputStream);
            
            outputStreamWriter.write(parameterData.toString());
            outputStreamWriter.flush();            
            if (httpURLConnection.getResponseCode() >= 300) {                throw new Exception("HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());
            }
            
            inputStream = httpURLConnection.getInputStream();
            inputStreamReader = new InputStreamReader(inputStream);
            reader = new BufferedReader(inputStreamReader);            
            while ((tempLine = reader.readLine()) != null) {
                resultBuffer.append(tempLine);
            }
            
        } finally {            
            if (outputStreamWriter != null) {
                outputStreamWriter.close();
            }            
            if (outputStream != null) {
                outputStream.close();
            }            
            if (reader != null) {
                reader.close();
            }            
            if (inputStreamReader != null) {
                inputStreamReader.close();
            }            
            if (inputStream != null) {
                inputStream.close();
            }
            
        }        return resultBuffer.toString();
    }

}

转载：http://www.cnblogs.com/nick-huang/p/3859353.html