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Spring MVC-ContentNegotiatingViewResolver

2016-04-25 16:46 741 查看

7.1 ContentNegotiatingViewResolver

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

7.2 示例

7.2.1 添加依赖

依赖

json依赖

03点睛Spring MVC 4.1-REST

已添加
xml

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-oxm</artifactId>
<version>${spring-framework.version}</version>
</dependency>

pdf

<dependency>
<groupId>com.lowagie</groupId>
<artifactId>itext</artifactId>
<version>4.2.1</version>
</dependency>

xls

<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.10-beta2</version>
</dependency>

7.2.2 定制view和viewResolve

7.2.2.1 pdf

7.2.2.1.1 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<String, Object> 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);
}

}

7.2.2.1.2 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();
}

}

7.2.2.2 xls

7.2.2.2.1 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<String, Object> 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);

}

}

7.2.2.2.2 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();
}

}

7.2.2.3 json

7.2.2.3.1 view

使用的是

MappingJackson2JsonView

7.2.2.3.2 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;
}

}

7.2.2.4 xml

7.2.2.4.1
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;
}

}

7.2.2.4.2 view

使用的是

MarshallingView

7.2.2.4.3 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;
}

}

7.2.2.5 jsp

7.2.2.5.1 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"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>

</head>
<body>
id/name <br/>
${demoObj.id}/${demoObj.name}
</body>
</html>

7.2.2.5.2 viewResolver

UrlBasedViewResolver

或

InternalResourceViewResolver

7.2.3 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")
@EnableWebMvc
public 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<ViewResolver> resolvers = new ArrayList<ViewResolver>();

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();
}

}

7.2.4
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;

@Controller
public 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";

}

}