URLConnections 类方法 openConnection() 返回一个 java.net.URLConnection。 例如： 如果你连接HTTP协议的URL, openConnection() 方法返回 HttpURLConnection 对象。 如果你连接的URL为一个 JAR 文件, openConnection() 方法将返回 JarURLConnection 对象。 代码如下:
客户端
package com.markor.url;
import com.alibaba.fastjson.JSON;
import org.apache.commons.lang.StringUtils;
import org.junit.Test;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Map;
/**
* @author: caichangmeng <modules@163.com>
* @date: 2018/10/22
* @module: 类所属模块
* @describe: urlConnection 练习
* @version: v1.0
*/
public class UrlConnectionTest {
public static void sendDemo(String targetUrl, String requestMethod, String contentType, String outputStr) throws IOException {
URL url = new URL(targetUrl);
URLConnection urlConnection = url.openConnection();
HttpURLConnection connection = null;
if (urlConnection instanceof HttpURLConnection) {
connection = (HttpURLConnection) urlConnection;
connection.setRequestMethod(requestMethod);
} else {
System.out.println("url 非 http请求");
return;
}
if (StringUtils.equalsIgnoreCase("json", contentType)) {
connection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
}
connection.setDoInput(true);
connection.setDoOutput(true);
connection.connect();
//往服务器端写内容 也就是发起http请求需要带的参数
if (null != outputStr) {
OutputStream os = connection.getOutputStream();
os.write(outputStr.getBytes("utf-8"));
//os.close();
}
System.out.println("contentType: " + connection.getContentType());
BufferedReader br = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
StringBuffer sb = new StringBuffer();
String current;
while ((current = br.readLine()) != null) {
// sb.append(current);
System.out.println(current);
}
System.out.println(sb.toString());
}
@Test
public void notArgus() throws IOException {
sendDemo("http://localhost:8081/notArgus", "GET", null, null);
}
/**
* @Date: 2018/10/22
* @describe: get - 传值.
*/
@Test
public void argus() throws IOException {
sendDemo("http://localhost:8081/argus?path=path-success", "GET", null, null);
}
/**
* @Date: 2018/10/22
* @describe: post.
*/
@Test
public void postNotArgus() throws IOException {
sendDemo("http://localhost:8081/postNotArgus", "POST", null, null);
}
/**
* @Date: 2018/10/22
* @describe: post - 表单模式传值.
*/
@Test
public void postArgus() throws IOException {
sendDemo("http://localhost:8081/postArgus", "POST", null, "pageNum=1&pageSize=10");
}
/**
* @Date: 2018/10/22
* @describe: post, json模式传值.
*/
@Test
public void postJson() throws IOException {
Map<String, Integer> map = new HashMap<>();
map.put("pageSize", 10);
map.put("pageNum", 1);
sendDemo("http://localhost:8081/postJson", "POST", "json", JSON.toJSONString(map));
}
}
服务端
package com.markor.template.controller.url;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
import java.util.Map;
/**
* @author: caichangmeng <modules@163.com>
* @date: 2018/10/22
* @module: 类所属模块
* @describe:
* @version: v1.0
*/
@RestController
public class UrlController {
/**
* @Date: 2018/10/22
* @describe: 无参请求 - get
* @return : success: 成功
* @throws:
* @since: 1.0.0
* @JIRA:
*/
@GetMapping("notArgus")
public String notArgus() {
return "get - success";
}
/**
* @Date: 2018/10/22
* @describe: 有参请求
* @param path :
* @return : path
* @throws:
* @since: 1.0.0
* @JIRA:
*/
@GetMapping("argus")
public String argus(String path) {
return path;
}
/**
* @Date: 2018/10/22
* @describe: 无参请求 - post
* @param null :
* @return : null
* @throws:
* @since: 1.0.0
* @JIRA:
*/
@PostMapping("postNotArgus")
public String postNotArgus() {
return "post - success";
}
@PostMapping("postArgus")
public UrlBean postArgus(UrlBean bean) {
return bean;
}
@PostMapping("postJson")
public String postJson(@RequestBody Map<String, Integer> param) {
int pageNum = param.get("pageNum");
int pageSize = param.get("pageSize");
return "pageNum: "+ pageNum +"; pageSize: " + pageSize;
}
}
