我正在尝试从各种目录中读取大量XML文件，并使用Web服务将这些信息从我的java程序传递到网页前端。
我决定使用JSON和特殊的GSON以及JSP前端来做到这一点。我的java程序执行了xml读取并打印到JSON文件，它都是有效的JSON。然后我拿了这个页面并尝试创建一个Web服务（我第一次这样做！）：
package myweb;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
public class WeblogicConfig
{
static DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
static String Path = "*****server path here*****";
//static String Path = "/apps/wls/dev";
static File directory = new File(Path);
static JSONObject fileObject = new JSONObject();
static JSONArray appArray = new JSONArray();
static JSONArray serverArray = new JSONArray();
static JSONArray JNDIArray = new JSONArray();
static FileWriter file;
public WeblogicConfig()
{
}
@SuppressWarnings({ "unchecked"})
public static JSONObject setWLServerInfo() throws Exception
{
File[] files = directory.listFiles();
try
{
for (File file : files)
{
if (file.isDirectory() && !file.getCanonicalPath().toString().contains("tmp")
&& !file.getCanonicalPath().toString().contains("config_prev"))
{
setWLServerInfo();
}
else
{
if(file.isFile() && file.getName().equals("config.xml"))
{
Path = file.getCanonicalPath().toString();
displayManagedServerProp(directory,Path);
fileObject.put("Server Details",serverArray);
fileObject.get("Region");
}
}
}
}
catch(FileNotFoundException e)
{
e.printStackTrace();
}
return fileObject;
}
@SuppressWarnings("unchecked")
public static void displayManagedServerProp(File file, String Path)
{
try
{
File currentFile = new File(Path);
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(currentFile);
doc.getDocumentElement().normalize();
NodeList serverNodeList = doc.getElementsByTagName("server");
NodeList domainNodeList = doc.getElementsByTagName("security-configuration");
NodeList regionNodeList = doc.getElementsByTagName("server-start");
Node domainNode = domainNodeList.item(0);
Element domainElement = (Element) domainNode;
Node regionNode = regionNodeList.item(0);
Element regionElement = (Element) regionNode;
for (int temp2 = 0; temp2 < serverNodeList.getLength(); temp2++)
{
JSONObject serverObject= new JSONObject();
JSONObject portObject= new JSONObject();
JSONObject addressObject= new JSONObject();
JSONObject pathObject = new JSONObject();
Node serverNode = serverNodeList.item(temp2);
if(temp2 == 1) //run for first loop for each file only
{
pathObject.put("Domain",domainElement.getElementsByTagName("name").item(0).getTextContent());
pathObject.put("WL Version", doc.getElementsByTagName("domain-version").item(0).getTextContent());
pathObject.put("Path ",Path);
pathObject.put("Region ", regionElement.getElementsByTagName("root-directory").item(0).getTextContent().substring(10,13));
}
if (serverNode.getNodeType() == Node.ELEMENT_NODE && serverNode.hasChildNodes())
{
Element serverElement = (Element) serverNode;
if(serverElement.getElementsByTagName("name").item(0).getTextContent().equals("AdminServer"))
{
}
else
{
serverObject.put("Managed Server: ", serverElement.getElementsByTagName("name").item(0).getTextContent());
portObject.put("Listen Port: ",serverElement.getElementsByTagName("listen-port").item(0).getTextContent());
addressObject.put("Listen Address: ", serverElement.getElementsByTagName("listen-address").item(0).getTextContent());
serverArray.add(pathObject);
serverArray.add(serverObject);
serverArray.add(portObject);
serverArray.add(addressObject);
}
}
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
从这里我有以下JSP调用它，但是我不确定如何解析JSON对象，我应该在发送对象之前在webservice中执行它还是应该继续在JSP中执行它？
<%@page import="javax.jws.WebMethod"%>
<%@page import="javax.jws.WebService"%>
<%@page import="myweb.*" %>
<%@page import="org.json.simple.*" %>
<%@page import="com.google.gson.JsonParser"%>
<%@page import="com.google.gson.JsonElement"%>
<%@page import="com.google.gson.JsonObject"%>
<%@page import="com.google.gson.*"%>
<%@page import="java.io.StringReader"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Weblogic Server Config</title>
</head>
<body>
<form action="index.jsp">
<input type="hidden" value="submit" id="submit" name="submit" />
<input type="submit" value="Weblogic Config" />
<% WeblogicConfig myWeblogicConfig = new WeblogicConfig();
if(request.getParameter("submit") !=null)
{
JSONObject json = myWeblogicConfig.setWLServerInfo().toString;
JsonParser parser = new JsonParser();
JsonElement jsonTree = parser.parse(json);
//String json = "{ \"f1\":\"Hello\",\"f2\":{\"f3:\":\"World\"}}";
if(jsonTree.isJsonObject())
{
JsonObject jsonObject = jsonTree.getAsJsonObject();
JsonElement f1 = jsonObject.get("Server Detail:");
out.println(" JSONElement is: " + json );
//out.println(" JSONElement is: " + f1);
}
}
%>
</form>
</body>
</html>
此代码创建按钮但按下按钮后会发生DefaultErrorHandler.javacError错误：
Stacktrace:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:103)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:366)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:468)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:378)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:646)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
如果我使用注释字符串，即没有从Web服务中读取的基本功能，它确实有效。我猜测在JSONObject的调用或赋值中出现了问题，但不确定是什么？
任何帮助都表示赞赏，最初我与杰克逊JSON合作，但经过一些研究决定转移到GSON。
答案 0 :(得分：0)
**问题来自我的webservice，我急忙删除了一个我最初传入setWLServerInfo（）方法的文件类型，现在看起来有点像这样：
public static JSONObject setWLServerInfo(File dir) throws Exception
然后我创建了另一种方法来调用。
public JSONObject getJSONObject() throws Exception
{
JSONObject WLConfigJsonObject = setWLServerInfo(directory);
return WLConfigJsonObject;
}
现在我成功传递了对象并且当前只是将其打印到屏幕上并且它似乎是有效的JSON，我只需要解析它。