java - 从 Wavemaker 中的 Eclipse 导入的 .jar 文件中调用我的 testImage() 方法时出错

Question

我只是想在 Wavemaker 中调用我的 testImage() 方法。在 Eclipse 中完美运行应用程序后，我导入了 .jar 文件。但是，当我在 Wavemaker 的 .jar 文件中调用相同的方法时，它给出了这个错误:

  Error
Compile failed with output: [{"filename" : "master/services/MyJavaService1/src/com/demo_jquery/myjavaservice1/MyJavaService1.java","type" : "ERROR","lineNumber" : 134,"columnNumber" : 22,"startPosition" : 4743,"endPosition" : 4751,"message" : "The method testImage() in the type pictures.TestUrl is not applicable for the arguments (java.lang.String)"}]

我现在将向您展示 TestUrl 类，我调用该类来调用我的两个方法 testImage() 和 getImage():

package pictures;



import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import javax.imageio.ImageIO;

/*
 * By: Victor Foning
 * 
 * This program will consist of two Methods: 
 * 
 * The First will Test the Validity and reachability of an validity 
 *  of an image URL.
 *  
 * The second methods will log4j
 * 
 * 
 * 
 * 
 * 
 */
public class TestUrl {

       public Boolean testImage (String l) {

         //  String urlString = "http://www.eurobiopark.org/sites/default/files/EurobioparkMashups5.1.png";
             System.out.println("Using " + l);

          // Open connection

             URL u = null;
            try {
                u = new URL( l);
            } catch (MalformedURLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
             URLConnection connection = null;
            try {
                connection = u.openConnection();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

          // Check if response code is HTTP_OK (200)

             HttpURLConnection httpConnection 
                   = (HttpURLConnection) connection;
             int code = 0;
            try {
                code = httpConnection.getResponseCode();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
             String message = null;
            try {
                message = httpConnection.getResponseMessage();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } 
             System.out.println(code + " " + message);
             if (code == HttpURLConnection.HTTP_OK) {

                 return true;

             } else {
                return false;
             }



       }

       public void getImage (String u)  {

           BufferedImage image =null;
            try{

                URL url =new URL(u);


                // read the url
               image = ImageIO.read(url);



                ImageIO.write(image, "jpg",new File("C://Users//Foning//Desktop//GeoDataLab//mash7.jpg"));

            }catch(IOException e){
                e.printStackTrace();
            }

        }
}

图片下载到本地，控制台输出是这样的:

Using http://www.eurobiopark.org/sites/default/files/EurobioparkMashups5.1.png

200 好正确

这是我的 TestDownload 主类，我通过它调用我的两个方法:

   package pictures;

import java.io.IOException;


/*
 * By: Victor Foning 17/Septembre/2019
 * 
 * From this Main Methods we will call: 
 * 
 * TestUrl.java and the GetImage.java Methods
 * 
 * 
 * 
 */
public class TestDownload {

    public static void main(String[] args)  {

           String path = "http://www.eurobiopark.org/sites/default/files/EurobioparkMashups5.1.png";

        // We Begin encapsulating the TestUrl Methods


        TestUrl im = new TestUrl();

        boolean image = im.testImage(path);
        if(image){
             im.getImage(path);
           System.out.print("true");



        }

        else{
            System.out.print(" victor_WakeUP_false");
        }



    }

}

然后，我将 .jar 文件(粗体)导出到 Wavemaker 中，并通过我的 JavaService 类进行相同的方法调用:

包com.demo_jquery.myjavaservice1;

import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import pictures.TestUrl;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import org.springframework.beans.factory.annotation.Autowired;


import com.wavemaker.runtime.security.SecurityService;
import com.wavemaker.runtime.service.annotations.ExposeToClient;
import com.wavemaker.runtime.service.annotations.HideFromClient;

在这里，您将找到我在 javaService1 类中创建的类 getImageFromWaveMaker() 来调用我的两个方法:

    package com.demo_jquery.myjavaservice1;

import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import pictures.TestUrl;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import org.springframework.beans.factory.annotation.Autowired;


import com.wavemaker.runtime.security.SecurityService;
import com.wavemaker.runtime.service.annotations.ExposeToClient;
import com.wavemaker.runtime.service.annotations.HideFromClient;

import com.demo_jquery.myjavaservice1.model.*;


@ExposeToClient
public class MyJavaService1 {

    private static final Logger logger = LoggerFactory.getLogger(MyJavaService1.class);

    @Autowired
    private SecurityService securityService;


    public void getImageFromWavemaker( String p) {



           String path  = 
          "http://www.eurobiopark.org/sites/default/files/EurobioparkMashups5.1.png";


        // We Begin encapsulating the TestUrl Methods


        TestUrl im = new TestUrl();

        boolean image = im.testImage(path);
        if(image){
             //im.getImage(url);
           logger.info("true");



        }

        else{
            logger.info("victor_WakeUP_false");
        }

    }
}

请帮我弄清楚为什么我运行此代码时会出现错误？

Answer 1

多亏了一些好 friend 的一些冥想和积极的重新定位，我才能够解决这个问题。

我开始意识到，即使在声明方法时接受驼峰命名法。我在 TestUrl 类中重新声明了这两种方法，并以大写字母开头。

引用错误代码:

Aslo，了解java中的所有类都是从对象类派生的，并且String类是Java中最重要的类之一。当我在 Eclipse 中创建所有类时，我将 java.lang.String 类设置为 super 类。

我做了一个maven编译，它生成了一个.jar文件。我继续将 .jar 文件上传到 Wavemaker 上的资源库文件中，将我的变量与我的 JavaService 类相应绑定(bind)，结果很好。

请随意表达对此问题的任何进一步看法，我很高兴听到。谢谢你!