SpringMVC自定义多视图解析器

实现通过请求url后缀判断返回值类型, 例如 localhost:8080/list 返回JSP页面, localhost:8080/list.json返回json格式数据

1.创建一枚举返回值类型

public enum ResultType { REDIRECT, JSP, JSON, XML }

2.创建自定义的viewResolver

 1 public class JsonViewResolver implements ViewResolver {
 2
 3     private View view;
 4
 5     public View getView() {
 6         return view;
 7     }
 8
 9     public void setView(View view) {
10         this.view = view;
11     }
12
13     @Override
14     public View resolveViewName(String viewName, Locale locale)
15             throws Exception {
16         return this.view;
17     }
18
19 }

JsonViewResolver

 1 public class XmlViewResolver implements ViewResolver {
 2
 3     private View view;
 4
 5     public View getView() {
 6         return view;
 7     }
 8
 9     public void setView(View view) {
10         this.view = view;
11     }
12
13     @Override
14     public View resolveViewName(String viewName, Locale locale)
15             throws Exception {
16         return this.view;
17     }
18
19 }

XmlViewResolver

 1 public class MultipleViewResolver extends WebApplicationObjectSupport implements
 2         ViewResolver {
 3
 4     private Map<String, ViewResolver> resolvers;
 5     private String DefaultViewResolverName = null;
 6
 7     public Map<String, ViewResolver> getResolvers() {
 8         return resolvers;
 9     }
10
11     public void setResolvers(Map<String, ViewResolver> resolvers) {
12         this.resolvers = resolvers;
13     }
14
15     public String getDefaultViewResolverName() {
16         return DefaultViewResolverName;
17     }
18
19     public void setDefaultViewResolverName(String defaultViewResolverName) {
20         DefaultViewResolverName = defaultViewResolverName;
21     }
22
23     private ViewResolver getDefaultViewResolver() {
24         return this.resolvers.get(this.DefaultViewResolverName);
25     }
26
27     @Override
28     public View resolveViewName(String viewName, Locale locale)
29             throws Exception {
30         ViewResolver viewResolver = null;
31         if (viewName.equalsIgnoreCase("json") || viewName.equalsIgnoreCase("xml")) {
32             return this.resolvers.get(viewName).resolveViewName(viewName, locale);
33         }
34         int index = viewName.indexOf(":");
35         if (index == -1) {
36             viewResolver = this.getDefaultViewResolver();
37         } else {
38             if (viewName.substring(0, index).equalsIgnoreCase("redirect")) {
39                 viewResolver = this.getDefaultViewResolver();
40             } else {
41                 viewResolver = this.resolvers.get(viewName.substring(0, index));
42                 viewName = viewName.substring(index + 1);
43             }
44         }
45
46         if(viewResolver != null) {
47             return viewResolver.resolveViewName(viewName, locale);
48         }
49         return null;
50     }
51
52 }

MultipleViewResolver

3.创建MyBaseController, 使所有的Controller都对其继承

 1 public abstract class MyBaseController {
 2
 3     public final String JSON = "json";
 4     public final String XML = "xml";
 5
 6     protected String result(ResultType resultType, String url) {
 7
 8         resultType = resultType == null ? ResultType.JSP : resultType;
 9
10         String ext = RequestUtil.getLookupPathExtension(ThreadLocalUtil
11                 .getRequest());
12
13         if (ext == null) {
14             if (resultType.equals(ResultType.JSON)
15                     || resultType.equals(ResultType.XML)) {
16                 return resultType.name().toLowerCase();
17             }
18         } else if ("JSON".equalsIgnoreCase(ext) || "XML".equalsIgnoreCase(ext)) {
19             return ext;
20         }
21         if (resultType.equals(ResultType.REDIRECT)) {
22             ext = RequestUtil.getLookupPathFullExtension(ThreadLocalUtil
23                     .getRequest());
24             if (ext != null) {
25                 url += ext;
26             }
27         }
28
29         return resultType.name().toLowerCase() + ":" + url;
30     }
31 }

MyBaseController

4.SpringMVC配置

    <bean name="viewResolver"
        class="org.matrixframework.common.viewresolver.MultipleViewResolver">
        <property name="defaultViewResolverName" value="jsp" />
        <property name="resolvers">
            <map>
                <entry key="jsp">
                    <!-- JSP视图解析器 -->
                    <bean name="internalResourceViewResolver"
                        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
                        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
                        <property name="prefix" value="/WEB-INF/views/jsp" />
                        <property name="suffix" value=".jsp" />
                    </bean>
                </entry>
                <entry key="json">
                    <!-- JSON视图解析器 -->
                    <bean name="jsonViewResolver" class="com.framework.common.viewresolver.JsonViewResolver">
                        <property name="view">
                            <bean class="org.springframework.web.servlet.view.json.MappingJackson2JsonView">
                                <property name="contentType" value="text/html; charset=utf-8"/>
                            </bean>
                        </property>
                    </bean>
                </entry>
            </map>
        </property>
    </bean>