工作积累Java篇

行创云篇

一 、后端控制的页面跳转

1. 第一种跳转到某个视图层，如tiles文件中定义的login，指向页面的/WEB-INF/views/account/login.jsp
   所以当我使用return new ModelAndView("login");时实际是找到tiles中名为login的视图，渲染对应的login.jsp页面到返回给前端显示。[渲染视图和页面数据]

   tiles.xml部分代码:

   <?xml version="1.0" encoding="UTF-8" ?>
   <!DOCTYPE tiles-definitions PUBLIC
   	    "-//Apache Software Foundation//DTD Tiles Configuration 2.1//EN"
        "http://tiles.apache.org/dtds/tiles-config_2_1.dtd">
   <tiles-definitions>
   	<!-- account settings -->
      <definition name="login" extends="simpleLayout">
           <put-attribute name="content" value="/WEB-INF/views/account/login.jsp"/>
       </definition>
      <definition name="regist" extends="simpleLayout">
          <put-attribute name="content" value="/WEB-INF/views/account/regist.jsp"/>
      </definition>
     ···
     <!--公司主页-->
    <definition name="trace-home" extends="singleLayout">
    	   <put-attribute name="content" value="/WEB-INF/views/trace/home.jsp"/>
     </definition>
    <!--项目主页-->
     <definition name="project-index" extends="ns-layout">
    	   <put-attribute name="content" value="/WEB-INF/views/trace/project-index.jsp"/>
     </definition>
    <definition name="trace-index" extends="simpleLayout">
     	  <put-attribute name="content" value="/WEB-INF/views/trace/index.jsp"/>
    </definition>
   </tiles-definitions>
   
   

2. 第二种，拼接地址跳转,相当于戳后台指定接口。如CommonTraceController.java中有如下模块，当我在控制层执行如下代码时return new ModelAndView(new RedirectView("/trace", true));时，会去控制层找到xx/trace接口，按CommonTraceController.java中声明的接口实际返回return new ModelAndView("project-index")，这个时候同第一种请求方式，即在tiles.xml中找到标签为“project-index”的页面/WEB-INF/views/trace/project-index.jsp，渲染对应jsp的视图和数据

   注：public RedirectView(String url, boolean contextRelative)函数表示重定向的一种构造方式，url表示需要重定向的地址，contextReleative表示是否延续之前的请求地址。如在localhost:8080/login下请求了该控制层，当contextReleative=true的会重定向到localhost:8080/trace；反之false会重定向到localhost:8080/login/trace

   CommonTraceController.java部分代码

   @Controller
   @RequestMapping("/trace")
   public class CommonTraceController extends BaseController{
   	@RequestMapping(value={"/index"}, method = RequestMethod.GET)
   		public String index(Model model) {
      	 return "trace-index";
     }
   
   @RequestMapping(value={"/home"}, method = RequestMethod.GET)
   public String home(Model model) {
       return "trace-home";
   }
   
   @RequestMapping(value={""}, method = RequestMethod.GET)
   public String projectIndex(Model model) {
       return "project-index";
   }
   ···
   // 选择合同公用页面
   @RequestMapping(value={"/public/select/contract"}, method = RequestMethod.GET)
   public String publicSelectContract(Model model) {
       return "trace-public-select-contract";
   }
   // 选择材料公用页面
   @RequestMapping(value={"/public/select/material"}, method = RequestMethod.GET)
   public String publicSelectMaterial(Model model) {
       return "trace-public-select-material";
   }
   // 选择材料类别公用页面
   @RequestMapping(value={"/public/select/material/category"}, method = RequestMethod.GET)
   public String publicSelectMaterialCategory(Model model) {
       return "trace-public-select-material-category";
   }
   

}
```

参考资料

• Spring Boot中的return new ModelAndView(“xxx”) 和 return "xxx"的区别
• struts-configxml中contextRelative=true是什么