Question

我在应用程序中使用struts 1.1，我需要从数据库值填充下拉菜单，并将其设置为我的操作中的表单bean，显示以下jsp。

<td width="80%" class="formfield" valign='top'>
    <html:select property="selectedUsedByUserName">
    <html:option value="" >-</html:option>
    <html:optionsCollection property="usedByUserList" label="name" value="staffNo"/>
    </html:select>
</td>

在表单bean中我使用了getter和setter，

private UserDTO selectedUsedByUser = null;
private HashMap usedByUserListMap = new HashMap();

public UserDTO[] getUsedByUserList() {
    return (UserDTO[]) usedByUserListMap.values().toArray(new UserDTO[0]);
}

public void setUsedByUserList(UserDTO[] usedByUserList) {
    usedByUserListMap.clear();
    if (usedByUserList != null) {
        for (int i = 0; i < usedByUserList.length; i++) {
            usedByUserListMap.put(
                    String.valueOf(usedByUserList[i].getStaffNo()),
                    usedByUserList[i]);
        }
    }
}

public String getSelectedUsedByUserName() {
    String selectedUsedByUserName = null;
    UserDTO tempSelectedUsedByUser = getSelectedUsedByUser();
    if (tempSelectedUsedByUser != null) {
        selectedUsedByUserName = String.valueOf(tempSelectedUsedByUser
                .getStaffNo());
    }
    return selectedUsedByUserName;
}

public void setSelectedUsedByUserName(String string) {
    UserDTO tempSelectedUsedByUserName = null;
    if (string != null) {
        tempSelectedUsedByUserName = (UserDTO) usedByUserListMap
                .get(string);
    }
    setSelectedUsedByUser(tempSelectedUsedByUserName);
}

public UserDTO getSelectedUsedByUser() {
    return selectedUsedByUser;
}

public void setSelectedUsedByUser(UserDTO usedByUser) {
    this.selectedUsedByUser = usedByUser;
}

但是当我打印异常的堆栈跟踪时，我会在下面看到。请问这个例外的原因是什么，

根据TLD或标记文件，属性属性是必需的标签选择 org.apache.jasper.compiler.DefaultErrorHandler.jspError（DefaultErrorHandler.java:78）在 org.apache.jasper.compiler.ErrorDispatcher.dispatch（ErrorDispatcher.java:373）在 org.apache.jasper.compiler.ErrorDispatcher.jspError（ErrorDispatcher.java:201）在 org.apache.jasper.compiler.Validator $ ValidateVisitor.visit（Validator.java:833）在org.apache.jasper.compiler.Node $ CustomTag.accept（Node.java:1501）at at org.apache.jasper.compiler.Node $ Nodes.visit（Node.java:2291）at at org.apache.jasper.compiler.Node $ Visitor.visitBody（Node.java:2341）at at org.apache.jasper.compiler.Validator $ ValidateVisitor.visit（Validator.java:870）在org.apache.jasper.compiler.Node $ CustomTag.accept（Node.java:1501）at at org.apache.jasper.compiler.Node $ Nodes.visit（Node.java:2291）at at org.apache.jasper.compiler.Node $ Visitor.visitBody（Node.java:2341）at at org.apache.jasper.compiler.Node $ Visitor.visit（Node.java:2347）at at org.apache.jasper.compiler.Node $ Root.accept（Node.java:498）at at org.apache.jasper.compiler.Node $ Nodes.visit（Node.java:2291）at at org.apache.jasper.compiler.Validator.validate（Validator.java:1853）at at org.apache.jasper.compiler.Compiler.generateJava（Compiler.java:210）at at org.apache.jasper.compiler.Compiler.compile（Compiler.java:435）at org.apache.jasper.JspCompilationContext.compile（JspCompilationContext.java:608）在 org.apache.jasper.servlet.JspServletWrapper.service（JspServletWrapper.java:360）在 org.apache.jasper.servlet.JspServlet.serviceJspFile（JspServlet.java:486）在org.apache.jasper.servlet.JspServlet.service（JspServlet.java:380）在javax.servlet.http.HttpServlet.service（HttpServlet.java:847）at org.apache.catalina.core.ApplicationFilterChain.servletService

我已经在jsp select标签中设置了属性属性。我们是否需要在jsp加载之前将其设置为一个值。我相信我们使用它来跟踪在填充右下角后选择的选项？那么一旦我们选择一个值，struts会将所选值设置为正确吗？

Struts html：选择下拉填充错误，说属性属性是必需的

0 个答案: