SSM 整合的坑

页面显示原本的字符

• jsp的 isELIgnored="false"
   

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路径问题总结

• 在index.jsp的表单提交是 <form action="account/save" method="post">
• 如果写成了<form action="/account/save" method="post"> 会跳转http://localhost:8888/ssm_war/account/account/findAll 错误

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• 下图中/account/findAll是正确的，如果写成account/findAll，地址栏还是http://localhost:8888/ssm_war/account/save，但是404报错，没有路径提示，小心

@Controller
@RequestMapping("/account")
public class AccountController {
    @RequestMapping("/findAll")
    public String findAll(Model model){
    ···    
    ｝
    @RequestMapping("/save")
    public void saveAccount(Account account, HttpServletRequest res, HttpServletResponse rsp) throws ServletException, IOException {
        accountService.saveAccount(account);
        res.getRequestDispatcher("/account/findAll").forward(res, rsp);
    }
｝

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• sendRedirct方法中/account/findAll会跳转http://localhost:8888/account/findAll，
• sendRedirct方法中account/findAll会跳转http://localhost:8888/ssm_war/account/account/findAll
• res.getContextPath()表示的是/ssm_war，后面没有斜杠

@Controller
@RequestMapping("/account")
public class AccountController {
    @RequestMapping("/findAll")
    public String findAll(Model model){
        ···    
    ｝
    @RequestMapping("/save")
    public void saveAccount(Account account, HttpServletRequest res, HttpServletResponse rsp) throws ServletException, IOException {
        accountService.saveAccount(account);
        //都错rsp.sendRedirect("/account/findAll");
        //下面才对 
        rsp.sendRedirect(res.getContextPath()+"/account/findAll"); 
    }
｝

---

 

当然，都可以用springmvc的return "forward:xxxxx和return "redirect:xxxx简化
 

• 下面正确跳转，"forward:转发的JSP路径"，不走视图解析器了，所以需要编写完整的路径
• 如果写成了WEB-INF/pages/list.jsp会报/ssm_war/account/WEB-INF/pages/list.jsp 404错误

@Controller
@RequestMapping("/account")
public class AccountController {
    @RequestMapping("/findAll")
    public String findAll(Model model){
        ···    
    ｝
    @RequestMapping("/save")
    public String saveAccount(Account account) throws ServletException, IOException {
        return "forward:/WEB-INF/pages/list.jsp";
    }
｝

---

 

• 下面也正确
• 如果写成了account/findAll 跳转到http://localhost:8888/ssm_war/account/save，报404错误，没有路径提示，小心

@Controller
@RequestMapping("/account")
public class AccountController {
    @RequestMapping("/findAll")
    public String findAll(Model model){
        ···    
    ｝
    @RequestMapping("/save")
    public String saveAccount(Account account) throws ServletException, IOException {
        return "forward:/account/findAll";
    }
｝

---

 

• 下面的正确，会跳转到http://localhost:8888/ssm_war/index.jsp
• springmvc的重定向 不用加项目名称
• 如果写成redirect:index.jsp，会跳转到http://localhost:8888/ssm_war/account/index.jsp，不正确

@Controller
@RequestMapping("/account")
public class AccountController {
    @RequestMapping("/findAll")
    public String findAll(Model model){
        ···    
    ｝
    @RequestMapping("/save")
    public String saveAccount(Account account) throws ServletException, IOException {
        //return "redirect:/index.jsp";
    }
｝

---

 

• 下面的正确，跳转到http://localhost:8888/ssm_war/account/findAll
• 如果写成"redirect:account/findAll"会跳转到http://localhost:8888/ssm_war/account/account/findAll

@Controller
@RequestMapping("/account")
public class AccountController {
    @RequestMapping("/findAll")
    public String findAll(Model model){
        ···    
    ｝
    @RequestMapping("/save")
    public String saveAccount(Account account) throws ServletException, IOException {
        return "redirect:/account/findAll";
    }
｝