Example tutorial of calling interface in java
Nov 13, 2019 am 11:50 AM
1. First URL restURL = new URL(url); The url is the target interface address that needs to be adjusted, and the URL class is java.net.* category under.
2, setRequestMethod("POST"); The request method has two values ??to choose from, one is GET and the other is POST, select the corresponding request method
3. setDoOutput(true);setDoInput(true);
setDoInput(): // 設(shè)置是否向httpUrlConnection輸出，因?yàn)檫@個(gè)是post請(qǐng)求，參數(shù)要放在http正文內(nèi)， 因此需要設(shè)為true, 默認(rèn)是false; setDoOutput(): // 設(shè)置是否從httpUrlConnection讀入，默認(rèn)情況下是true;
4. setAllowUserInteraction();allowUserInteraction If true, user interaction is allowed (such as pop-up This URL is checked within the context of a validation dialog box.
5. The query in the following code is transmitted in the form of "attribute=value". If there are multiple queries, it is passed in the form of "attribute=value&attribute=value". It is passed to the server and let the server handle it by itself.
6, close();Create a stream to write or read the return value. Remember to close the stream after creation.
Example tutorial:
package com.c;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
public class RestUtil {
public String load(String url,String query) throws Exception
{
URL restURL = new URL(url);
/*
* 此處的urlConnection對(duì)象實(shí)際上是根據(jù)URL的請(qǐng)求協(xié)議(此處是http)生成的URLConnection類 的子類
HttpURLConnection
*/
HttpURLConnection conn = (HttpURLConnection) restURL.openConnection();
//請(qǐng)求方式
conn.setRequestMethod("POST");
//設(shè)置是否從httpUrlConnection讀入，默認(rèn)情況下是true; httpUrlConnection.setDoInput(true);
conn.setDoOutput(true);
//allowUserInteraction 如果為 true，則在允許用戶交互（例如彈出一個(gè)驗(yàn)證對(duì)話框）的上下文中對(duì)此 URL 進(jìn)行檢查。
conn.setAllowUserInteraction(false);
PrintStream ps = new PrintStream(conn.getOutputStream());
ps.print(query);
ps.close();
BufferedReader bReader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line,resultStr="";
while(null != (line=bReader.readLine()))
{
resultStr +=line;
}
System.out.println("3412412---"+resultStr);
bReader.close();
return resultStr;
}
public static void main(String []args) {try {
RestUtil restUtil = new RestUtil();
String resultString = restUtil.load(
"http://192.168.10.89:8080/eoffice-restful/resources/sys/oaholiday",
"floor=first&year=2017&month=9&isLeader=N");
} catch (Exception e) {
// TODO: handle exception
System.out.print(e.getMessage());
}
}
}Recommended tutorial:Java tutorial
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