需要导入jar包 ，用来json解析
//jar,选择一个就行，主要是用以post发送数据时转json,本工具用的alibaba json。
<!--org json -->
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.8</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<!--net json -->
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib</artifactId>
<version>2.4</version>
<classifier>jdk15</classifier>
</dependency>
<!--alibaba json -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.47</version>
</dependency>
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.List;
import java.util.Map;
import com.alibaba.fastjson.JSONObject;
/*
* java post/get请求工具类
*/
public class HttpUtil {
/**
* 发送GET请求
*
* @param url
* String
* @param parameters
* Map【String, Object】
* @return
*/
public static String sendGet(String url, Map<String, Object> parameters) {
String result = "";
BufferedReader in = null;// 读取响应输入流
StringBuffer sb = new StringBuffer();// 存储参数
String params = "";// 编码之后的参数
try {
// 编码请求参数
if (parameters.size() == 1) {
for (String name : parameters.keySet()) {
sb.append(name).append("=")
.append(java.net.URLEncoder.encode(String.valueOf(parameters.get(name)), "UTF-8"));
}
params = sb.toString();
} else {
for (String name : parameters.keySet()) {
sb.append(name).append("=")
.append(java.net.URLEncoder.encode(String.valueOf(parameters.get(name)), "UTF-8"))
.append("&");
}
String temp_params = sb.toString();
params = temp_params.substring(0, temp_params.length() - 1);
}
String full_url = url + "?" + params;
// System.out.println(full_url);
// 创建URL对象
java.net.URL connURL = new java.net.URL(full_url);
// 打开URL连接
java.net.HttpURLConnection httpConn = (java.net.HttpURLConnection) connURL.openConnection();
// 设置通用属性
httpConn.setRequestProperty("Accept", "*/*");
httpConn.setRequestProperty("Connection", "Keep-Alive");
httpConn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");
// 建立实际的连接
httpConn.connect();
// 响应头部获取
Map<String, List<String>> headers = httpConn.getHeaderFields();
// 遍历所有的响应头字段
// for (String key : headers.keySet()) {
// System.out.println(key + "\t：\t" + headers.get(key));
// }
// 定义BufferedReader输入流来读取URL的响应,并设置编码方式
in = new BufferedReader(new InputStreamReader(httpConn.getInputStream(), "UTF-8"));
String line;
// 读取返回的内容
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}
/**
* 发送POST请求
*
* @param url
* String
* @param map
* Map【String, Object】
* @return String
*/
public static String sendPost(String url, Map<String, Object> map) {
// 返回的结果
StringBuffer result = new StringBuffer();
// 读取响应输入流
BufferedReader in = null;
PrintWriter out = null;
HttpURLConnection httpConn=null;
// 处理请求参数
StringBuffer sb = new StringBuffer();
// 编码之后的参数
String params = "";
try {
JSONObject json = new JSONObject(map);
// 编码请求参数
if (json.size() == 1) {
for (String name : json.keySet()) {
sb.append(name).append("=").append(String.valueOf(json.get(name)));
}
params = sb.toString();
} else {
for (String name : json.keySet()) {
sb.append(name).append("=").append(String.valueOf(json.get(name))).append("&");
}
String temp_params = sb.toString();
params = temp_params.substring(0, temp_params.length() - 1);
}
// 创建URL对象
URL connURL = new URL(url);
// 打开URL连接
httpConn = (HttpURLConnection) connURL.openConnection();
// 设置通用属性
httpConn.setRequestMethod("POST");
httpConn.setConnectTimeout(10000);
httpConn.setReadTimeout(10000);
// 设置POST方式
httpConn.setDoInput(true);
httpConn.setDoOutput(true);
// httpConn.setRequestProperty("Accept", "*/*");
// httpConn.setRequestProperty("Connection", "Keep-Alive");
// httpConn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0;
// Windows NT 6.1)");
// httpConn.setRequestProperty("Content-Type",
// "application/json;charset=UTF-8");
// 获取HttpURLConnection对象对应的输出流
out = new PrintWriter(httpConn.getOutputStream());
// 发送请求参数
out.write(params);
// flush输出流的缓冲
out.flush();
if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) {
String line = "";
in = new BufferedReader(new InputStreamReader(httpConn.getInputStream(), "utf-8"));
while ((line = in.readLine()) != null) {
result.append(line);
}
in.close();
return result.toString();
} else {
throw new Exception("HTTP_POST_ERROR_RETURN_STATUS：" + httpConn.getResponseCode());
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
httpConn.disconnect();
} catch (IOException ex) {
ex.printStackTrace();
}
}
return null;
}
// 发送GET 请求举例
// ******************************************************************************
// Map<String,Object> params = new HashMap<String,Object>();
// params.put("user", "lgg");
// String result = HttpUtil.sendGet("https://mp.csdn.net/postedit", params);
// System.out.println("结果是:"+result);
// ******************************************************************************
// 发送POST一般请求
// ******************************************************************************
// Map<String,Object> params = new HashMap<String,Object>();
// params.put("user", "lgg");
// String result = HttpUtil.sendPost("https://mp.csdn.net/postedit", params);
// System.out.println("结果是:"+result);
// ******************************************************************************
// 发送POST的json请求
// ******************************************************************************
// User user = new User();
// user.setName("张三");
// user.setAge(18);
// Map<String,Object> params = new HashMap<String,Object>();
// params.put("queryJson", JSON.toJSONString(user));
// String result = HttpUtil.sendPost("https://mp.csdn.net/postedit", params);
// System.out.println("结果是:"+result);
// ******************************************************************************
}
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