8. Spring MVC4.1-ContentNegotiatingViewResolver-白红宇

8. Spring MVC4.1-ContentNegotiatingViewResolver

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发布时间：2019-05-25

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ContentNegotiatingViewResolver支持在Spring MVC下输出不同的格式;

ContentNegotiatingViewResolver是ViewResolver的一个实现;

ContentNegotiatingViewResolver使用request的媒体类型,根据扩展名选择不同的view输出不同的格式;

ContentNegotiatingViewResolver不是自己处理view,而是代理给不同的ViewResolver来处理不同的view;

本例演示根据扩展名获得不同的页面;

jsp
- view:WEB-INF/views/demoObj.jsp
- viewResolver:UrlBasedViewResolver或InternalResourceViewResolver

pdf
- view:PdfView
- viewResolver:PdfViewResolver

json
- view:MappingJackson2JsonView
- viewResolver:JsonViewResolver

xml
- view:MarshallingView
- viewResolver:XmlViewResolver

xls
- view:XlsView
- viewResolver:XlsViewResolver

8.2 示例

8.2.1 添加依赖

依赖

json依赖03点睛Spring MVC 4.1-REST已添加


              
             
              org.springframework
               
             
              spring-oxm
               
             
              ${spring-framework.version}


              
             
              com.lowagie
               
             
              itext
               
             
              4.2.1


              
             
              org.apache.poi
               
             
              poi
               
             
              3.10-beta2

8.2.2 定制view和viewResolve

8.2.2.1 pdf

8.2.2.1.1 view

package com.wisely.view;import java.awt.Color;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.view.document.AbstractPdfView;import com.lowagie.text.Document;import com.lowagie.text.Element;import com.lowagie.text.pdf.PdfPTable;import com.lowagie.text.pdf.PdfWriter;import com.wisely.domain.DemoObj;public class PdfView extends AbstractPdfView {    @Override    protected void buildPdfDocument(Map
          
            model,            Document document, PdfWriter writer, HttpServletRequest request,            HttpServletResponse response) throws Exception {        DemoObj demoObj = (DemoObj) model.get("demoObj");        PdfPTable table = new PdfPTable(2);        table.getDefaultCell().setHorizontalAlignment(Element.ALIGN_CENTER);        table.getDefaultCell().setVerticalAlignment(Element.ALIGN_MIDDLE);        table.getDefaultCell().setBackgroundColor(Color.lightGray);        table.addCell("ID");        table.addCell("NAME");        table.addCell(demoObj.getId().toString());        table.addCell(demoObj.getName());        document.add(table);    }}

8.2.2.1.2 viewResolver

package com.wisely.viewresolver;import java.util.Locale;import org.springframework.web.servlet.View;import org.springframework.web.servlet.ViewResolver;import com.wisely.view.PdfView;public class PdfViewResolver implements ViewResolver{    @Override    public View resolveViewName(String viewName, Locale locale)            throws Exception {        return new PdfView();    }}

8.2.2.2 xls

8.2.2.2.1 view

package com.wisely.view;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.ss.usermodel.Cell;import org.apache.poi.ss.usermodel.CellStyle;import org.apache.poi.ss.usermodel.IndexedColors;import org.apache.poi.ss.usermodel.Row;import org.apache.poi.ss.usermodel.Sheet;import org.springframework.web.servlet.view.document.AbstractExcelView;import com.wisely.domain.DemoObj;public class XlsView extends AbstractExcelView{    @Override    protected void buildExcelDocument(Map
          
            model,            HSSFWorkbook workbook, HttpServletRequest request,            HttpServletResponse response) throws Exception {         DemoObj demoObj = (DemoObj) model.get("demoObj");            Sheet sheet = workbook.createSheet("sheet1");            CellStyle style = workbook.createCellStyle();            style.setFillForegroundColor(IndexedColors.GREY_40_PERCENT.index);            style.setFillPattern(CellStyle.SOLID_FOREGROUND);            style.setAlignment(CellStyle.ALIGN_CENTER);            Row row = null;            Cell cell = null;            int rowCount = 0;            int colCount = 0;            // 创建头部            row = sheet.createRow(rowCount++);            cell = row.createCell(colCount++);            cell.setCellStyle(style);            cell.setCellValue("ID");            cell = row.createCell(colCount++);            cell.setCellStyle(style);            cell.setCellValue("NAME");            // 创建数据            row = sheet.createRow(rowCount++);            colCount = 0;            row.createCell(colCount++).setCellValue(demoObj.getId());            row.createCell(colCount++).setCellValue(demoObj.getName());            for (int i = 0; i < 3; i++)                sheet.autoSizeColumn(i, true);    }}

8.2.2.2.2 viewResolver

package com.wisely.viewresolver;import java.util.Locale;import org.springframework.web.servlet.View;import org.springframework.web.servlet.ViewResolver;import com.wisely.view.XlsView;public class XlsViewResolver implements ViewResolver{    @Override    public View resolveViewName(String viewName, Locale locale)            throws Exception {        return new XlsView();    }}

8.2.2.3 json

8.2.2.3.1 view

使用的是MappingJackson2JsonView

8.2.2.3.2 viewResolver

package com.wisely.viewresolver;import java.util.Locale;import org.springframework.web.servlet.View;import org.springframework.web.servlet.ViewResolver;import org.springframework.web.servlet.view.json.MappingJackson2JsonView;public class JsonViewResolver implements ViewResolver{    @Override    public View resolveViewName(String viewName, Locale locale)            throws Exception {        MappingJackson2JsonView view = new MappingJackson2JsonView();        view.setPrettyPrint(true);        return view;    }}

8.2.2.4 xml

8.2.2.4.1 DemoBean的额外配置

package com.wisely.domain;import javax.xml.bind.annotation.XmlElement;import javax.xml.bind.annotation.XmlRootElement;@XmlRootElement(name = "demo")public class DemoObj {    private Long id;    private String name;    public DemoObj() {        super();    }    public DemoObj(Long id, String name) {        super();        this.id = id;        this.name = name;    }    public Long getId() {        return id;    }    @XmlElement    public void setId(Long id) {        this.id = id;    }    public String getName() {        return name;    }    @XmlElement    public void setName(String name) {        this.name = name;    }}

8.2.2.4.2 view

使用的是MarshallingView

8.2.2.4.3 viewResolver

package com.wisely.viewresolver;import java.util.Locale;import org.springframework.oxm.jaxb.Jaxb2Marshaller;import org.springframework.web.servlet.View;import org.springframework.web.servlet.ViewResolver;import org.springframework.web.servlet.view.xml.MarshallingView;import com.wisely.domain.DemoObj;public class XmlViewResolver implements ViewResolver {    @Override    public View resolveViewName(String viewName, Locale locale)            throws Exception {        MarshallingView view = new MarshallingView();        Jaxb2Marshaller marshaller = new Jaxb2Marshaller();        marshaller.setClassesToBeBound(DemoObj.class);        marshaller.setPackagesToScan("com.wisely.domain");        view.setMarshaller(marshaller);        return view;    }}

8.2.2.5 jsp

8.2.2.5.1 view

WEB-INF/views/demoObj.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
          Insert title here        id/name 
        ${demoObj.id}/${demoObj.name}

8.2.2.5.2 viewResolver

UrlBasedViewResolver或InternalResourceViewResolver

8.2.3 配置resolver

package com.wisely;import java.util.ArrayList;import java.util.List;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;import org.springframework.http.MediaType;import org.springframework.web.accept.ContentNegotiationManager;import org.springframework.web.multipart.MultipartResolver;import org.springframework.web.multipart.commons.CommonsMultipartResolver;import org.springframework.web.servlet.ViewResolver;import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;import org.springframework.web.servlet.config.annotation.EnableWebMvc;import org.springframework.web.servlet.config.annotation.InterceptorRegistry;import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;import org.springframework.web.servlet.view.ContentNegotiatingViewResolver;import org.springframework.web.servlet.view.JstlView;import org.springframework.web.servlet.view.UrlBasedViewResolver;import com.wisely.interceptors.DemoInteceptor;import com.wisely.viewresolver.JsonViewResolver;import com.wisely.viewresolver.PdfViewResolver;import com.wisely.viewresolver.XlsViewResolver;import com.wisely.viewresolver.XmlViewResolver;@Configuration@ComponentScan("com.wisely")@EnableWebMvcpublic class DemoMVCConfig extends WebMvcConfigurerAdapter {    //在此---jsp viewResolver    @Bean    public UrlBasedViewResolver viewResolver() {        UrlBasedViewResolver resolver = new UrlBasedViewResolver();        resolver.setPrefix("/WEB-INF/views/");        resolver.setSuffix(".jsp");        resolver.setViewClass(JstlView.class);        return resolver;    }    // 注册自定义拦截器    @Override    public void addInterceptors(InterceptorRegistry registry) {        registry.addInterceptor(demoInteceptor());    }    // 自定义拦截器    @Bean    public DemoInteceptor demoInteceptor() {        return new DemoInteceptor();    }    // 静态资源映射    @Override    public void addResourceHandlers(ResourceHandlerRegistry registry) {        registry.addResourceHandler("/js/**").addResourceLocations("/js/");    }    // 文件上传设置    @Bean    public MultipartResolver multipartResolver() {        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();        multipartResolver.setMaxUploadSize(1000000);        return multipartResolver;    }    // 在此---配置ContentNegotiationManager,在无后缀名情况下默认为jsp view resolver    @Override    public void configureContentNegotiation(            ContentNegotiationConfigurer configurer) {        configurer.ignoreAcceptHeader(true).defaultContentType(                MediaType.TEXT_HTML);    }    // 在此---配置ContentNegotiatingViewResolver,通过此代理到不同的viewResolover    @Bean    public ViewResolver contentNegotiatingViewResolver(            ContentNegotiationManager manager) {        ContentNegotiatingViewResolver resolver = new ContentNegotiatingViewResolver();        resolver.setContentNegotiationManager(manager);        List
          
            resolvers = new ArrayList
           
            ();        resolvers.add(xmlViewResolver());        resolvers.add(jsonViewResolver());        resolvers.add(viewResolver());// jsp view resolver        resolvers.add(pdfViewResolver());        resolvers.add(xlsViewResolver());        resolver.setViewResolvers(resolvers);        return resolver;    }    //在此---xml viewResolver    @Bean    public ViewResolver xmlViewResolver() {        return new XmlViewResolver();    }    //在此---json viewResolver    @Bean    public ViewResolver jsonViewResolver() {        return new JsonViewResolver();    }    //在此---pdf viewResolver    @Bean    public ViewResolver pdfViewResolver() {        return new PdfViewResolver();    }    //在此---excel viewResolver    @Bean    ViewResolver xlsViewResolver() {        return new XlsViewResolver();    }}

8.2.4 演示控制器

package com.wisely.web;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import com.wisely.domain.DemoObj;@Controllerpublic class ContentController {    @RequestMapping(value = "/getdemo",method = RequestMethod.GET)    public String getDemo(Model model){        DemoObj demoObj = new DemoObj(333l, "WYF");        model.addAttribute("demoObj",demoObj);        return "demoObj";    }}