AJAX 跨域调用

前台代码：

Html代码  

1. <script type="text/javascript" src="jquery-1.7.2.min.js"></script>

2. <script type="text/javascript">

3. function RegisterRequest2() {

4. /* getJSON method is ok also...

5. $.getJSON("http://192.168.1.154:7087/ClusterServer/Rigister?jsoncallback=?", { pwd: '123', username: 'tl' }, function(json) { alert(json.name); });　

6. */

7. $.ajax({

8. url: "http://192.168.1.154:7087/ClusterServer/Rigister?jsoncallback=?",

9. type: "GET",

10. data: { pwd: '123', username: 'tl' },

11. dataType: "jsonp",

12. success: function(data) {

13. alert(data.name);

14. },

15. error: function(a, b, c) {

16. alert("error==" + b);

17. }

18. });

19. }

20. </script>

21. <input type="button" onclick="RegisterRequest2();"  value="StartRequest" />

后台Servlet代码：

Java代码  

1. import java.io.IOException;

2. import javax.servlet.ServletException;

3. import javax.servlet.http.HttpServlet;

4. import javax.servlet.http.HttpServletRequest;

5. import javax.servlet.http.HttpServletResponse;

6. public class Rigister extends HttpServlet {

7. @Override

8. protected void doGet(HttpServletRequest req, HttpServletResponse resp)

9. throws ServletException, IOException {

10. String pwd = req.getParameter("pwd");

11. String username =req.getParameter("username");

12. System.out.println("get=="+username+"  ==="+pwd);

13. String callback = req.getParameter("jsoncallback");

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

15. }

16. @Override

17. protected void doPost(HttpServletRequest req, HttpServletResponse resp)

18. throws ServletException, IOException {

19. String pwd = req.getParameter("pwd");

20. String username =req.getParameter("username");

21. System.out.println("post=="+username+"  ==="+pwd);

22. String callback = req.getParameter("jsoncallback");

23. resp.getWriter().write(callback + "({name:'tzy',phone:'123'})");

24. }

25. }

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