Java 类org.springframework.web.servlet.mvc.annotation.ModelAndViewResolver 实例源码

@Override
protected ModelAndView doResolveException(HttpServletRequest request, HttpServletResponse response,
                                          Object _handler, Exception ex) {
    HandlerMethod handler = (HandlerMethod) _handler;
    if (handler == null) {
        return null;
    }
    Method method = handler.getMethod();
    if (method.isAnnotationPresent(JsonBody.class) && ex != null) {
        logger.error("server is error", ex);
        Object value = null;
        if (ex instanceof ServiceException) {
            value = new JsonResult<Object>(((ServiceException) ex).getCode(), ex.getMessage());
        } else {
            value = new JsonResult<Object>(-1, ex.getMessage());
        }
        try {
            JsonUtil.writeValue(response.getWriter(), value);
        } catch (IOException e) {
            Throwables.propagateIfPossible(e);
        }
        return ModelAndViewResolver.UNRESOLVED;
    }
    return null;
}

@Test
public void mavResolver() throws ServletException, IOException {
    initServlet(new ApplicationContextInitializer<GenericWebApplicationContext>() {
        @Override
        public void initialize(GenericWebApplicationContext wac) {
            RootBeanDefinition adapterDef = new RootBeanDefinition(RequestMappingHandlerAdapter.class);
            ModelAndViewResolver[] mavResolvers = new ModelAndViewResolver[] {new MyModelAndViewResolver()};
            adapterDef.getPropertyValues().add("modelAndViewResolvers", mavResolvers);
            wac.registerBeanDefinition("handlerAdapter", adapterDef);
        }
    }, ModelAndViewResolverController.class);

    MockHttpServletRequest request = new MockHttpServletRequest("GET", "/");
    MockHttpServletResponse response = new MockHttpServletResponse();
    getServlet().service(request, response);
    assertEquals("myValue", response.getContentAsString());

}

@Override
    protected ModelAndView doResolveException(HttpServletRequest request, HttpServletResponse response,
                                              Object _handler, Exception ex) {
        LOGGER.info("jsonBody exception....");
        HandlerMethod handler = (HandlerMethod) _handler;
        if (handler == null) {
            // like 'GET' not supported
            return null;
        }

        Method method = handler.getMethod();

        if (method.isAnnotationPresent(JsonBody.class)) {
//            String config = super.determineViewName(ex, request);
//            Object value = Strings.isNullOrEmpty(config) ? ex : JsonSerializer.parseConfig(config, ex);
            JsonSerializer.write(ex, method, request, response);
            // skip other resolver and view render
            return ModelAndViewResolver.UNRESOLVED;
        }

        return null;
    }

@Test
public void mavResolver() throws ServletException, IOException {
    initServlet(new ApplicationContextInitializer<GenericWebApplicationContext>() {
        @Override
        public void initialize(GenericWebApplicationContext wac) {
            RootBeanDefinition adapterDef = new RootBeanDefinition(RequestMappingHandlerAdapter.class);
            ModelAndViewResolver[] mavResolvers = new ModelAndViewResolver[] {new MyModelAndViewResolver()};
            adapterDef.getPropertyValues().add("modelAndViewResolvers", mavResolvers);
            wac.registerBeanDefinition("handlerAdapter", adapterDef);
        }
    }, ModelAndViewResolverController.class);

    MockHttpServletRequest request = new MockHttpServletRequest("GET", "/");
    MockHttpServletResponse response = new MockHttpServletResponse();
    getServlet().service(request, response);
    assertEquals("myValue", response.getContentAsString());

}

@Override
public void handleReturnValue(Object returnValue, MethodParameter returnType,
        ModelAndViewContainer mavContainer, NativeWebRequest webRequest) throws Exception {

    if (this.mavResolvers != null) {
        for (ModelAndViewResolver mavResolver : this.mavResolvers) {
            Class<?> handlerType = returnType.getContainingClass();
            Method method = returnType.getMethod();
            ExtendedModelMap model = (ExtendedModelMap) mavContainer.getModel();
            ModelAndView mav = mavResolver.resolveModelAndView(method, handlerType, returnValue, model, webRequest);
            if (mav != ModelAndViewResolver.UNRESOLVED) {
                mavContainer.addAllAttributes(mav.getModel());
                mavContainer.setViewName(mav.getViewName());
                if (!mav.isReference()) {
                    mavContainer.setView(mav.getView());
                }
                return;
            }
        }
    }

    // No suitable ModelAndViewResolver...
    if (this.modelAttributeProcessor.supportsReturnType(returnType)) {
        this.modelAttributeProcessor.handleReturnValue(returnValue, returnType, mavContainer, webRequest);
    }
    else {
        throw new UnsupportedOperationException("Unexpected return type: " +
                returnType.getParameterType().getName() + " in method: " + returnType.getMethod());
    }
}

@Before
public void setUp() {
    mavResolvers = new ArrayList<ModelAndViewResolver>();
    handler = new ModelAndViewResolverMethodReturnValueHandler(mavResolvers);
    mavContainer = new ModelAndViewContainer();
    request = new ServletWebRequest(new MockHttpServletRequest());
}

@Override
@SuppressWarnings("rawtypes")
public ModelAndView resolveModelAndView(Method method, Class handlerType, Object returnValue,
        ExtendedModelMap model, NativeWebRequest request) {
    if (returnValue != null && returnValue.getClass().equals(returnValueType)) {
        return new ModelAndView("viewName", "modelAttrName", returnValue);
    }
    else {
        return ModelAndViewResolver.UNRESOLVED;
    }
}

public void handleReturnValue(
        Object returnValue, MethodParameter returnType,
        ModelAndViewContainer mavContainer, NativeWebRequest request)
        throws Exception {

    if (this.mavResolvers != null) {
        for (ModelAndViewResolver mavResolver : this.mavResolvers) {
            Class<?> handlerType = returnType.getDeclaringClass();
            Method method = returnType.getMethod();
            ExtendedModelMap model = (ExtendedModelMap) mavContainer.getModel();
            ModelAndView mav = mavResolver.resolveModelAndView(method, handlerType, returnValue, model, request);
            if (mav != ModelAndViewResolver.UNRESOLVED) {
                mavContainer.addAllAttributes(mav.getModel());
                mavContainer.setViewName(mav.getViewName());
                if (!mav.isReference()) {
                    mavContainer.setView(mav.getView());
                }
                return;
            }
        }
    }

    // No suitable ModelAndViewResolver..

    if (this.modelAttributeProcessor.supportsReturnType(returnType)) {
        this.modelAttributeProcessor.handleReturnValue(returnValue, returnType, mavContainer, request);
    }
    else {
        throw new UnsupportedOperationException("Unexpected return type: "
                + returnType.getParameterType().getName() + " in method: " + returnType.getMethod());
    }
}

@Before
public void setUp() {
    mavResolvers = new ArrayList<ModelAndViewResolver>();
    handler = new ModelAndViewResolverMethodReturnValueHandler(mavResolvers);
    mavContainer = new ModelAndViewContainer();
    request = new ServletWebRequest(new MockHttpServletRequest());
}

@Override
@SuppressWarnings("rawtypes")
public ModelAndView resolveModelAndView(Method method, Class handlerType, Object returnValue,
        ExtendedModelMap model, NativeWebRequest request) {
    if (returnValue != null && returnValue.getClass().equals(returnValueType)) {
        return new ModelAndView("viewName", "modelAttrName", returnValue);
    }
    else {
        return ModelAndViewResolver.UNRESOLVED;
    }
}

/**
 * Return the configured {@link ModelAndViewResolver}s, or {@code null}.
 */
public List<ModelAndViewResolver> getModelAndViewResolvers() {
    return modelAndViewResolvers;
}

/**
 * Create a new instance.
 */
public ModelAndViewResolverMethodReturnValueHandler(List<ModelAndViewResolver> mavResolvers) {
    this.mavResolvers = mavResolvers;
}

/**
 * Return the configured {@link ModelAndViewResolver}s, or {@code null}.
 */
public List<ModelAndViewResolver> getModelAndViewResolvers() {
    return modelAndViewResolvers;
}

/**
 * Create a new instance.
 */
public ModelAndViewResolverMethodReturnValueHandler(List<ModelAndViewResolver> mavResolvers) {
    this.mavResolvers = mavResolvers;
}

/**
 * Set a custom ModelAndViewResolvers to use for special method return types.
 * Such a custom ModelAndViewResolver will kick in first, having a chance to
 * resolve an return value before the standard ModelAndView handling kicks in.
 */
public void setCustomModelAndViewResolver(ModelAndViewResolver customModelAndViewResolver) {
    this.customModelAndViewResolvers = new ModelAndViewResolver[]{customModelAndViewResolver};
}

/**
 * Set one or more custom ModelAndViewResolvers to use for special method return types.
 * Any such custom ModelAndViewResolver will kick in first, having a chance to
 * resolve an return value before the standard ModelAndView handling kicks in.
 */
public void setCustomModelAndViewResolvers(ModelAndViewResolver... customModelAndViewResolvers) {
    this.customModelAndViewResolvers = customModelAndViewResolvers;
}

/**
 * Provide custom {@link ModelAndViewResolver}s.
 * <p><strong>Note:</strong> This method is available for backwards
 * compatibility only. However, it is recommended to re-write a
 * {@code ModelAndViewResolver} as {@link HandlerMethodReturnValueHandler}.
 * An adapter between the two interfaces is not possible since the
 * {@link HandlerMethodReturnValueHandler#supportsReturnType} method
 * cannot be implemented. Hence {@code ModelAndViewResolver}s are limited
 * to always being invoked at the end after all other return value
 * handlers have been given a chance.
 * <p>A {@code HandlerMethodReturnValueHandler} provides better access to
 * the return type and controller method information and can be ordered
 * freely relative to other return value handlers.
 */
public void setModelAndViewResolvers(List<ModelAndViewResolver> modelAndViewResolvers) {
    this.modelAndViewResolvers = modelAndViewResolvers;
}

/**
 * Set a custom ModelAndViewResolvers to use for special method return types.
 * Such a custom ModelAndViewResolver will kick in first, having a chance to
 * resolve an return value before the standard ModelAndView handling kicks in.
 */
public void setCustomModelAndViewResolver(ModelAndViewResolver customModelAndViewResolver) {
    this.customModelAndViewResolvers = new ModelAndViewResolver[]{customModelAndViewResolver};
}

/**
 * Set one or more custom ModelAndViewResolvers to use for special method return types.
 * Any such custom ModelAndViewResolver will kick in first, having a chance to
 * resolve an return value before the standard ModelAndView handling kicks in.
 */
public void setCustomModelAndViewResolvers(ModelAndViewResolver[] customModelAndViewResolvers) {
    this.customModelAndViewResolvers = customModelAndViewResolvers;
}

/**
 * Provide custom {@link ModelAndViewResolver}s.
 * <p><strong>Note:</strong> This method is available for backwards
 * compatibility only. However, it is recommended to re-write a
 * {@code ModelAndViewResolver} as {@link HandlerMethodReturnValueHandler}.
 * An adapter between the two interfaces is not possible since the
 * {@link HandlerMethodReturnValueHandler#supportsReturnType} method
 * cannot be implemented. Hence {@code ModelAndViewResolver}s are limited
 * to always being invoked at the end after all other return value
 * handlers have been given a chance.
 * <p>A {@code HandlerMethodReturnValueHandler} provides better access to
 * the return type and controller method information and can be ordered
 * freely relative to other return value handlers.
 */
public void setModelAndViewResolvers(List<ModelAndViewResolver> modelAndViewResolvers) {
    this.modelAndViewResolvers = modelAndViewResolvers;
}

/**
 * Set a custom ModelAndViewResolvers to use for special method return
 * types.
 * <p>
 * Such a custom ModelAndViewResolver will kick in first, having a chance to
 * resolve a return value before the standard ModelAndView handling kicks
 * in.
 */
public void setCustomModelAndViewResolver(
        ModelAndViewResolver customModelAndViewResolver) {
    this.customModelAndViewResolvers = new ModelAndViewResolver[] { customModelAndViewResolver };
}

/**
 * Set one or more custom ModelAndViewResolvers to use for special method
 * return types.
 * <p>
 * Any such custom ModelAndViewResolver will kick in first, having a chance
 * to resolve a return value before the standard ModelAndView handling kicks
 * in.
 */
public void setCustomModelAndViewResolvers(
        ModelAndViewResolver[] customModelAndViewResolvers) {
    this.customModelAndViewResolvers = customModelAndViewResolvers;
}