How to call the java interface (with code)-JavaBase-php.cn

How to call the java interface (with code)

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Release： 2019-11-26 09:28:21

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How to call the java interface (with code)

java calls the interface method:

package com.lwl.api.provider.demo.test;
 
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.HttpURLConnection;
import java.net.URL;
 
public class RestUtil {
    public String load(String url,String query) throws Exception
    {
        URL restURL = new URL(url);
        /*
         * 此处的urlConnection对象实际上是根据URL的请求协议(此处是http)生成的URLConnection类 的子类HttpURLConnection
         */
        HttpURLConnection conn = (HttpURLConnection) restURL.openConnection();
        //请求方式
        conn.setRequestMethod("POST");
        //设置是否从httpUrlConnection读入，默认情况下是true; httpUrlConnection.setDoInput(true);
        conn.setDoOutput(true);
        //allowUserInteraction 如果为 true，则在允许用户交互（例如弹出一个验证对话框）的上下文中对此 URL 进行检查。
        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("接口调用数据："+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) {
        System.out.print(e.getMessage());
    }
    }
}

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First URL restURL = new URL(url); the url in this is the target interface address that needs to be adjusted, URL Class is a class under java.net.*, which is not unfamiliar.

setRequestMethod("POST"); The request method has two values to choose from, one is GET and the other is POST. Select the corresponding request method

setDoOutput(true);setDoInput(true );

setDoInput() : // Set whether to output to httpUrlConnection. Because this is a post request, the parameters must be placed in the http body, so it needs to be set to true. The default is false;

setDoOutput(): //Set whether to read from httpUrlConnection, which is true by default;

setAllowUserInteraction();allowUserInteraction If true, in a context that allows user interaction (such as popping up a verification dialog box) Check this URL.

The query in the following code is transmitted in the form of attribute=value. If there are multiple queries, it is transmitted in the form of attribute=value&attribute=value. It is passed to the server and let the server handle it by itself.

How to generate this form? The simplest and fastest way is here: Java splices the Map into "parameter = value & parameter = value"

close(); Create a stream to write or read the return value. Remember to close the stream after creation .

For more java knowledge, please pay attention to the java basic tutorial column.

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