从Spring应用程序启动Java JPanel

vh0rcniy  于 2022-10-30  发布在  Spring
关注(0)|答案(1)|浏览(181)

我对Java Spring不是很有经验，但是我希望实现的是在用户提交表单后调用特定的控制器方法后启动JPanel。不幸的是，当我尝试在Spring应用程序中启动JPanel时，我遇到了一个错误。我试图找到将JPanel与Spring结合使用的示例，但我什么也找不到。因此我倾向于认为将JPanel与Spring结合使用是不可能的。
预期的行为是当表单被提交时，一些与提交的表单相关的信息会在新创建的JPanel中弹出。
另外，请注意，我尝试在一个单独的类中运行GUI生成代码，它运行得非常好。只有当我尝试在Spring应用程序内部运行代码时，问题才出现。
我的Spring控制器类（相关方法为createForm（））

package com.datavisulizer.datavisulizer;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.ModelAndView;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import javax.script.SimpleBindings;
import javax.swing.*;
import java.awt.BorderLayout;
import java.util.*;
import java.io.*;
import java.lang.*;
import org.objectweb.asm.*;

@Controller
public class indexController {

    @GetMapping("/create")
    public String createPage(Model model) {
        model.addAttribute("codeForm", new codeForm());
        return "create";
    }

    @PostMapping("/create")
    public String createForm(codeForm cf) throws Exception{
        System.out.println(cf.getCodeText());
        ArrayList<String[]> CL = codeParser(cf.getCodeText());
        String name = classFinder(CL);
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("java");
        //GUI Code START
        JFrame frame = new JFrame();
        frame.add( new JLabel(" Outout" ), BorderLayout.NORTH );

        JTextArea ta = new JTextArea();
        TextAreaOutputStream taos = new TextAreaOutputStream( ta, 60 );
        PrintStream ps = new PrintStream( taos );
        System.setOut( ps );
        System.setErr( ps );

        frame.add( new JScrollPane( ta )  );

        frame.pack();
        frame.setVisible( true );
        frame.setSize(800,600);
        //GUI CODE END

        if (engine == null) {
            System.err.println("Engine error (unknown engine)!");
        } else {
            try{
                engine.put(ScriptEngine.FILENAME, name);
                engine.eval(cf.getCodeText());
                cf.setCodeTextOutput("Java code Succefully compiled...");
            }
            catch(Exception ex){
                cf.setCodeTextOutput("Java code has an error");

            }

        }
        return "create";
    }

    private String classFinder(ArrayList<String[]> CL){
        String name = "_No_Name";
        if(CL.size()<1 || CL.get(0).length<2) return name;
        return CL.get(0)[CL.get(0).length-1] + ".java";
    }

    private ArrayList codeParser(String code){
        ArrayList<String> lineList = new ArrayList<String>();
        String line = "";
        for(int c = 0; c<code.length()-1; c++){
            if(code.substring(c, c+1).compareTo("{")==0 || code.substring(c, c+1).compareTo("}")==0){
                lineList.add(line);
                line = "";
            }
            else{
                line+=code.substring(c, c+1);
            }
        }
        ArrayList<String[]> codeList = new ArrayList<String[]>();
        for(String s : lineList){codeList.add(s.split(" "));}
        System.out.println("Testing code array list");
        for(String[] s : codeList){for(String c : s){System.out.println(c);}}
        return codeList;
    }

}

控制台日志

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.awt.HeadlessException] with root cause

java.awt.HeadlessException: null
        at java.desktop/java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:166) ~[na:na]
        at java.desktop/java.awt.Window.<init>(Window.java:553) ~[na:na]
        at java.desktop/java.awt.Frame.<init>(Frame.java:428) ~[na:na]
        at java.desktop/java.awt.Frame.<init>(Frame.java:393) ~[na:na]
        at java.desktop/javax.swing.JFrame.<init>(JFrame.java:180) ~[na:na]
        at com.datavisulizer.datavisulizer.indexController.createForm(indexController.java:34) ~[classes/:na]
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
        at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
        at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-5.3.23.jar:5.3.23]
        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-5.3.23.jar:5.3.23] 
        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.23.jar:5.3.23]
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.23.jar:5.3.23]
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.23.jar:5.3.23]
        at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.23.jar:5.3.23]
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1071) ~[spring-webmvc-5.3.23.jar:5.3.23]
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:964) ~[spring-webmvc-5.3.23.jar:5.3.23]
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.23.jar:5.3.23]
        at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.3.23.jar:5.3.23]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:696) ~[tomcat-embed-core-9.0.68.jar:4.0.FR]
        at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.23.jar:5.3.23]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:779) ~[tomcat-embed-core-9.0.68.jar:4.0.FR]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.68.jar:9.0.68]        
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.68.jar:9.0.68]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.68.jar:9.0.68]        
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.23.jar:5.3.23]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.23.jar:5.3.23]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.68.jar:9.0.68]        
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.23.jar:5.3.23]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.23.jar:5.3.23]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.68.jar:9.0.68]        
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.23.jar:5.3.23]       
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.23.jar:5.3.23]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.68.jar:9.0.68]        
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1789) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.68.jar:9.0.68]
        at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]
spring

1条答案

按热度按时间
euoag5mw

euoag5mw1#

根据Oracle中的文档，您只能执行此操作
创建轻量级组件，如Canvas、Panel和Swing组件（顶级组件除外
您可以使用启用无外设模式

System.setProperty("java.awt.headless", "true");

或

java -Djava.awt.headless=true
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