struts2 request有关问题

struts2 request问题

Java code

public class CreateTableSpaceAction extends ActionSupport{        private static final long serialVersionUID = 1L;            private HttpServletRequest request;        public HttpServletRequest getRequest() {            return request;        }        public void setRequest(HttpServletRequest request) {            this.request = request;        }                @Override        public String execute() throws Exception{                        System.out.println("======CreateTableSpaceAction=====");            //这里报空指针            String spaceName = (String) request.getAttribute("spaceName");//34行            System.out.println("spaceName:"+spaceName);            String spaceSize = request.getParameter("spaceSize");            String spacePath = request.getParameter("spacePath");            SysUserPOJO sysUserPOJO = getsysUser(request);            InitSysDAO initSysDAO = new InitSysDAO();

严重: Servlet.service() for servlet default threw exception
java.lang.NullPointerException
at com.asideal.action.sysInit.CreateTableSpaceAction.execute(CreateTableSpaceAction.java:34)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

[解决办法]
你在提交时有没有传spaceName这个参数
[解决办法]
表单提交问题，看参数名对应上了嘛，还有struts2最好不要这么传值，直接get/set接值比较好
[解决办法]
我记得request有其他方法可以取，你那个申明get set方法应该取不到
[解决办法]
request null? 还是request.getAttribute("spaceName") null 可以用输出先调试的看下
[解决办法]
public class CreateTableSpaceAction extends ActionSupport{

private static final long serialVersionUID = 1L;
private String spaceName;
public String getSpaceName(){
return spaceName;
};
public void setSpaceName(spaceName){
this.spaceName=spaceName;
}

private HttpServletRequest request;

public HttpServletRequest getRequest() {
return request;
}
public void setRequest(HttpServletRequest request) {
this.request = request;
}

//如果是用post的话这样就行了，如果是get的话就要传spaceName=?(?号是你要传的值)

@Override
public String execute() throws Exception{

System.out.println("======CreateTableSpaceAction=====");
System.out.println("spaceName:"+spaceName);
String spaceSize = request.getParameter("spaceSize");
String spacePath = request.getParameter("spacePath");
SysUserPOJO sysUserPOJO = getsysUser(request);
InitSysDAO initSysDAO = new InitSysDAO();

[解决办法]
request那样能取到吗？试试这样：httpservletrequest request=servletactionsupport.getrequest();
[解决办法]
拜托，request.getParameter("键名")
[解决办法]
request.getAttribute("spaceName");
改为 request.getParameter("spaceName");
试试
[解决办法]
boolean isExist = spaceIsExist(initSysDAO,spaceName,jdbc_ora_username,jdbc_ora_password

这句话抛出的异常 ? 那看下这个方法吧
[解决办法]
既然spaceName定义成属性，并且提供getter setter方法，那么可以直接用。不需要request.getParameter().还有总是感觉你那request是null。最好用ServletActionContext.getRequest()来获取下！
[解决办法]
String spaceName = (String) request.getAttribute("spaceName");//34行
这个改一下：

Java code

String spaceName = "";if(request.getAttribute("spaceName") != null && !"".equals(request.getAttribute("spaceName") [code=Java] 

 

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