Java 为什么jasper得到的是字符串而不是类对象？_Java_Jsp

Java 为什么jasper得到的是字符串而不是类对象？

java jsp

Java 为什么jasper得到的是字符串而不是类对象？,java,jsp,Java,Jsp,我试图通过属性将bean对象传递给自定义标记。豆子： statistic.tld <taglib> <tlib-version>1.0</tlib-version> <jsp-version>2.0</jsp-version> <short-name>Statistic TLD</short-name> <tag> <name>Statisti

我试图通过属性将bean对象传递给自定义标记。豆子：

statistic.tld

<taglib>
   <tlib-version>1.0</tlib-version>
   <jsp-version>2.0</jsp-version>
   <short-name>Statistic TLD</short-name>
   
   <tag>
      <name>Statistic</name>
      <tag-class>tags.StatisticTag</tag-class>
      <body-content></body-content>
      
      <attribute>
         <name>data</name>
         <required>true</required>
         <type>classes.Statistic</type>
         <fragment>false</fragment>
      </attribute>
   </tag>
</taglib>

JSP文件

<%@ taglib prefix = "st" uri = "WEB-INF/statistic.tld"%>
<jsp:useBean id="statisticData" class="classes.Statistic" scope="page" />
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Index</title>
</head>
<body>
    <st:Statistic data="${statisticData}" />
</body>
</html>

加载result.jsp时，出现错误：

org.apache.jasper.jaspereException:无法将字符串“${statisticData}”转换为属性“data”的类“classes.Statistic”：属性编辑器未向PropertyEditorManager注册

。那么为什么jasper得到的是字符串而不是类对象呢？如果没有引号，我会得到一个错误

org.apache.jasper.JasperException:/result.jsp（第9行，第21列）预期的引号符号

Hi，检查答案可能有帮助。@Swati它对我没有帮助：（Hi，检查答案可能有帮助。@Swati它对我没有帮助：(

public class StatisticTag extends SimpleTagSupport {
    private Statistic statistic;
    // ...
    
       public void doTag()
       throws JspException, IOException {
          // ...
       }
       
       public Statistic getData() {
            return statistic;
        }
     
        public void setData(Statistic value) {
            this.statistic = statistic;
        }
}

<%@ taglib prefix = "st" uri = "WEB-INF/statistic.tld"%>
<jsp:useBean id="statisticData" class="classes.Statistic" scope="page" />
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Index</title>
</head>
<body>
    <st:Statistic data="${statisticData}" />
</body>
</html>

request.setAttribute("statisticData", statistic);
getServletContext().getRequestDispatcher("/result.jsp").forward(request, response);