AJAX跨域代理机制实现原理解析------AJAX

àì夳堔傛蜴生んèń 2024-02-18 12:11 9阅读 0赞

>     package com.bjpowernode.httpClient;
>     
>     import org.apache.http.HttpEntity;
>     import org.apache.http.HttpResponse;
>     import org.apache.http.client.methods.HttpGet;
>     import org.apache.http.impl.client.CloseableHttpClient;
>     import org.apache.http.impl.client.HttpClients;
>     
>     import java.io.BufferedReader;
>     import java.io.InputStreamReader;
>     
>     public class httpClientSendGet {
>         public static void main(String args[]) throws Exception {
>             String channelId = "sdd";
>             String clientId = "123";
>             // 目标地址
>     //        String url = "http://XXX.XXX.com.cn/arowana/channel/getChannelLine?channelId=" + channelId + "&clientId=" + clientId;
>             String url = "http://localhost:8081/Test/hello";
>             HttpGet httpGet = new HttpGet(url);
>             // 设置类型 "application/x-www-form-urlencoded" "application/json"
>             httpGet.setHeader("Content-Type", "application/x-www-form-urlencoded");
>             System.out.println("调用URL: " + httpGet.getURI());//        httpClient实例化
>             CloseableHttpClient httpClient = HttpClients.createDefault();
>             // 执行请求并获取返回
>             HttpResponse response = httpClient.execute(httpGet);//
>             System.out.println("Response toString()" + response.toString());
>             HttpEntity entity = response.getEntity();
>             System.out.println("返回状态码：" + response.getStatusLine());
>             //得到返回数据的长度；没有该参数返回-1//
>             if (entity != null)
>             {
>                 System.out.println("返回消息内容长度: " + entity.getContentLength());
>             }
>             // 显示结果
>             BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));
>             String line = null;
>             StringBuffer responseSB = new StringBuffer();
>             while ((line = reader.readLine()) != null) {
>                 responseSB.append(line);
>             }
>             System.out.println("返回消息：" + responseSB);
>             reader.close();
>             httpClient.close();
>         }
>     }
> 
>     package com.bjpowernode.httpClient;
>     
>     import org.apache.http.HttpEntity;
>     import org.apache.http.HttpResponse;
>     import org.apache.http.client.methods.HttpGet;
>     import org.apache.http.impl.client.CloseableHttpClient;
>     import org.apache.http.impl.client.HttpClients;
>     
>     import java.io.BufferedReader;
>     import java.io.InputStreamReader;
>     
>     public class httpClientSendGet {
>         public static void main(String args[]) throws Exception {
>             String channelId = "sdd";
>             String clientId = "123";
>             // 目标地址
>     //        String url = "http://XXX.XXX.com.cn/arowana/channel/getChannelLine?channelId=" + channelId + "&clientId=" + clientId;
>             String url = "http://localhost:8081/Test/hello";
>             HttpGet httpGet = new HttpGet(url);
>             // 设置类型 "application/x-www-form-urlencoded" "application/json"
>             httpGet.setHeader("Content-Type", "application/x-www-form-urlencoded");
>             System.out.println("调用URL: " + httpGet.getURI());//        httpClient实例化
>             CloseableHttpClient httpClient = HttpClients.createDefault();
>             // 执行请求并获取返回
>             HttpResponse response = httpClient.execute(httpGet);//
>             System.out.println("Response toString()" + response.toString());
>             HttpEntity entity = response.getEntity();
>             System.out.println("返回状态码：" + response.getStatusLine());
>             //得到返回数据的长度；没有该参数返回-1//
>             if (entity != null)
>             {
>                 System.out.println("返回消息内容长度: " + entity.getContentLength());
>             }
>             // 显示结果
>             BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));
>             String line = null;
>             StringBuffer responseSB = new StringBuffer();
>             while ((line = reader.readLine()) != null) {
>                 responseSB.append(line);
>             }
>             System.out.println("返回消息：" + responseSB);
>             reader.close();
>             httpClient.close();
>         }
>     }

>     import jakarta.servlet.ServletException;
>     import jakarta.servlet.annotation.WebServlet;
>     import jakarta.servlet.http.HttpServlet;
>     import jakarta.servlet.http.HttpServletRequest;
>     import jakarta.servlet.http.HttpServletResponse;
>     
>     import java.io.IOException;
>     
>     @WebServlet("/hello")
>     public class Hello extends HttpServlet
>     {
>         @Override
>         protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
>             request.setCharacterEncoding("UTF-8");
>             response.setCharacterEncoding("UTF-8");
>             response.setContentType("text/html;charset=UTF-8");
>             //设置响应头
>     //        response.setHeader("Access-Control-Allow-Origin","http://localhost:8080");
>             //跨域访问的资源允许访问,设置响应头的方式原理是
>     
>             response.getWriter().println("{\"username\" : \"zhangSan\"};");
>         }
>     }
> 
>     import jakarta.servlet.ServletException;
>     import jakarta.servlet.annotation.WebServlet;
>     import jakarta.servlet.http.HttpServlet;
>     import jakarta.servlet.http.HttpServletRequest;
>     import jakarta.servlet.http.HttpServletResponse;
>     
>     import java.io.IOException;
>     
>     @WebServlet("/hello")
>     public class Hello extends HttpServlet
>     {
>         @Override
>         protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
>             request.setCharacterEncoding("UTF-8");
>             response.setCharacterEncoding("UTF-8");
>             response.setContentType("text/html;charset=UTF-8");
>             //设置响应头
>     //        response.setHeader("Access-Control-Allow-Origin","http://localhost:8080");
>             //跨域访问的资源允许访问,设置响应头的方式原理是
>     
>             response.getWriter().println("{\"username\" : \"zhangSan\"};");
>         }
>     }