加哥最近做第三方接口开发，对方提供的是get方式的http请求，下面加哥给大家进行了总结如何用java代码去发送http请求并获取结果。
下面是发送get请求的工具类
1.不要求携带token的方式
public static String getUrl(String tempurl,String bm) { String result=""; try { URL url = new URL(tempurl); InputStream is = null; URLConnection con=url.openConnection(); con.addRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)"); con.setConnectTimeout(120000); con.setReadTimeout(120000); con.connect(); try { is = con.getInputStream(); BufferedReader reader = null; try { reader = new BufferedReader(new InputStreamReader(is,bm)); String s=""; String linesep = System.getProperty("line.separator"); while((s = reader.readLine())!=null){ result += s+linesep ; } reader.close(); } catch (Exception e) { e.printStackTrace(); }finally { if (reader != null) { try { reader.close(); } catch (Exception e1) { } } } is.close(); }catch (FileNotFoundException e2) { ; } } catch (Exception e1) { e1.printStackTrace(); } return result; }
下面是使用封装的好的请求工具类发送请求
public static void main(String[] args) { String str = "http://110.43.47.12:8089/system/sim?population=5&iteration=2&prediction=5×tep=1&density=1"; String sql=Get.getUrl(str,"utf-8"); System.out.println(sql); }
注意请求发送后返回来的是JSON字符串，大家对其进行解析获取自己需要的数据即可。此外，还需注意第二个参数是编码格式。
2.要求携带token的方式
public static String getpage(String tempurl,String bm,String token ) {
String result="";
try {
URL url = new URL(tempurl);
InputStream is = null;
URLConnection con=url.openConnection();
con.addRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
con.setConnectTimeout(120000);
con.setReadTimeout(120000);
con.addRequestProperty("x-access-token",token);
con.connect();
try {
is = con.getInputStream();
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(is,bm));
String s="";
String linesep = System.getProperty("line.separator");
while((s = reader.readLine())!=null){
result += s+linesep ;
}
reader.close();
} catch (Exception e) {
e.printStackTrace();
}finally {
if (reader != null) {
try {
reader.close();
} catch (Exception e1) {
}
}
}
is.close();
}catch (FileNotFoundException e2) {
;
}
} catch (Exception e1) {
e1.printStackTrace();
}
return result;
}
