java中怎样用post，get，put请求

Question

如题所述

Answer 1

java中用post，get，put请求方法：
public static String javaHttpGet(String url,String charSet){

String resultData = null;
try {
URL pathUrl = new URL(url); //创建一个URL对象
HttpURLConnection urlConnect = (HttpURLConnection) pathUrl.openConnection(); //打开一个HttpURLConnection连接
urlConnect.setConnectTimeout(30000); // 设置连接超时时间
urlConnect.connect();
if (urlConnect.getResponseCode() == 200) { //请求成功
resultData = readInputStream(urlConnect.getInputStream(), charSet);
}
} catch (MalformedURLException e) {
LogL.getInstance().getLog().error("URL出错！", e);
} catch (IOException e) {
LogL.getInstance().getLog().error("读取数据流出错！", e);
}
return resultData;
}
public static String javaHttpPost(String url,Map<String,Object> map,String charSet){
String resultData=null;
StringBuffer params = new StringBuffer();
try {
Iterator<Entry<String, Object>> ir = map.entrySet().iterator();
while (ir.hasNext()) {
Map.Entry<String, Object> entry = (Map.Entry<String, Object>) ir.next();
params.append(URLEncoder.encode(entry.getKey(),charSet) + "=" + URLEncoder.encode(entry.getValue().toString(), charSet) + "&");
}
byte[] postData = params.deleteCharAt(params.length()).toString().getBytes();
URL pathUrl = new URL(url); //创建一个URL对象
HttpURLConnection urlConnect = (HttpURLConnection) pathUrl.openConnection();
urlConnect.setConnectTimeout(30000); // 设置连接超时时间
urlConnect.setDoOutput(true); //post请求必须设置允许输出
urlConnect.setUseCaches(false); //post请求不能使用缓存
urlConnect.setRequestMethod("POST"); //设置post方式请求
urlConnect.setInstanceFollowRedirects(true);
urlConnect.setRequestProperty("Content-Type","application/x-www-form-urlencoded; charset="+charSet);// 配置请求Content-Type
urlConnect.connect(); // 开始连接
DataOutputStream dos = new DataOutputStream(urlConnect.getOutputStream()); // 发送请求参数
dos.write(postData);
dos.flush();
dos.close();
if (urlConnect.getResponseCode() == 200) { //请求成功
resultData = readInputStream(urlConnect.getInputStream(),charSet);
}
} catch (MalformedURLException e) {
LogL.getInstance().getLog().error("URL出错！", e);
} catch (IOException e) {
LogL.getInstance().getLog().error("读取数据流出错！", e);
} catch (Exception e) {
LogL.getInstance().getLog().error("POST出错！", e);
}
return resultData;
}