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java执行get、post请求
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互联网集市收集整理的这篇技术教程文章主要介绍了java执行get、post请求，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含5392字，纯文字阅读大概需要8分钟。
内容图文
1、get
public static String Getcjsybx(Object data) {
try {
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMM");
Date date = new Date();
String now = sdf.format(date);
System.out.println(now);
// 传入参数
String realUrl = "http://xxxxxxxxxxxxx?access_token="+data+"&pageNo=1&pageSize=10&aae041=192001&aae042="+now+"type=51";
URL url = new URL(realUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
// 在连接之前设置属性
// Content-Type实体头用于向接收方指示实体的介质类型，指定HEAD方法送到接收方的实体介质类型，或GET方法发送的请求介质类型
conn.setRequestProperty("Content-Type", "application/json; charset=utf-8");
// 设置打开与此URLConnection引用的资源的通信链接时使用的指定超时值（以毫秒为单位）
conn.setConnectTimeout(10000);
// 将读取超时设置为指定的超时时间，以毫秒为单位。
// conn.setReadTimeout(60000);
conn.setRequestMethod("GET");
// Post 请求不能使用缓存
conn.setUseCaches(false);
// 建立连接
conn.connect();
// 获取响应
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
String result = "";
while ((line = reader.readLine()) != null) {
result += line;
}
reader.close();
conn.disconnect();
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (SocketTimeoutException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
2、post
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.activation.MimetypesFileTypeMap;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
public class HttpPostUploadUtil {
/**
* @param args
*/
public static void main(String[] args) {
String filepath="E:\\xxx\\0.jpg";
String urlStr = "http://127.0.0.1:8080/xxxxxxx";
Map<String, String> textMap = new HashMap<String, String>();
textMap.put("name", "testname");
Map<String, String> fileMap = new HashMap<String, String>();
fileMap.put("userfile", filepath);
String ret = formUpload(urlStr, textMap, fileMap);
System.out.println(ret);
}
/**
* 上传图片
*
* @param urlStr
* @param textMap
* @param fileMap
* @return
*/
public static String formUpload(String urlStr, Map<String, String> textMap,
Map<String, String> fileMap) {
String res = "";
HttpURLConnection conn = null;
String BOUNDARY = "---------------------------123821742118716"; //boundary就是request头和上传文件内容的分隔符
try {
URL url = new URL(urlStr);
conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5000);
conn.setReadTimeout(30000);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn
.setRequestProperty("User-Agent",
"Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.2.6)");
conn.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" + BOUNDARY);
OutputStream out = new DataOutputStream(conn.getOutputStream());
// text
if (textMap != null) {
StringBuffer strBuf = new StringBuffer();
Iterator iter = textMap.entrySet().iterator();
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) iter.next();
String inputName = (String) entry.getKey();
String inputValue = (String) entry.getValue();
if (inputValue == null) {
continue;
}
strBuf.append("\r\n").append("--").append(BOUNDARY).append(
"\r\n");
strBuf.append("Content-Disposition: form-data; name=\""
+ inputName + "\"\r\n\r\n");
strBuf.append(inputValue);
}
out.write(strBuf.toString().getBytes());
}
// file
if (fileMap != null) {
Iterator iter = fileMap.entrySet().iterator();
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) iter.next();
String inputName = (String) entry.getKey();
String inputValue = (String) entry.getValue();
if (inputValue == null) {
continue;
}
File file = new File(inputValue);
String filename = file.getName();
String contentType = new MimetypesFileTypeMap()
.getContentType(file);
if (filename.endsWith(".png")) {
contentType = "image/png";
}
if (contentType == null || contentType.equals("")) {
contentType = "application/octet-stream";
}
StringBuffer strBuf = new StringBuffer();
strBuf.append("\r\n").append("--").append(BOUNDARY).append(
"\r\n");
strBuf.append("Content-Disposition: form-data; name=\""
+ inputName + "\"; filename=\"" + filename
+ "\"\r\n");
strBuf.append("Content-Type:" + contentType + "\r\n\r\n");
out.write(strBuf.toString().getBytes());
DataInputStream in = new DataInputStream(
new FileInputStream(file));
int bytes = 0;
byte[] bufferOut = new byte[1024];
while ((bytes = in.read(bufferOut)) != -1) {
out.write(bufferOut, 0, bytes);
}
in.close();
}
}
byte[] endData = ("\r\n--" + BOUNDARY + "--\r\n").getBytes();
out.write(endData);
out.flush();
out.close();
// 读取返回数据
StringBuffer strBuf = new StringBuffer();
BufferedReader reader = new BufferedReader(new InputStreamReader(
conn.getInputStream()));
String line = null;
while ((line = reader.readLine()) != null) {
strBuf.append(line).append("\n");
}
res = strBuf.toString();
if(!"".equals(res)){
String tr="["+res+"]";
JSONArray json = JSONArray.fromObject(tr);
Object data = json.getJSONObject(0).get("access_token");
reader.close();
reader = null;
} catch (Exception e) {
System.out.println("发送POST请求出错。" + urlStr);
e.printStackTrace();
} finally {
if (conn != null) {
conn.disconnect();
conn = null;
}
}
return res;
}
}
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