欢迎使用优快云-markdown编辑器

首先需要安装office web apps，具体安装过程我是参照下面这篇博客完成的
Office Web Apps安装部署，安装完成后访问 http://officewebapps.pepper.cn/hosting/discovery,这里的officewebapps.pepper.cn为office web apps 服务器的域名，也可以使用 ip地址，如 192.168.1.54.成功之后会看到如下文件：

接下来就是与自己的项目整合，首先需要了解WOPI协议（Web Application Open Platform Interface），

WOPI协议提供一系列基于web方式的，使文档能在Office Web Apps中查看与编辑的接口服务（Web Service）。只要web应用按照标准，实现了WOPI的接口，那么就可以调用Office Web Apps。例子很多，比如SharePoint，Exchange，SkyDriver，Dropbox集成Office Web Apps。如果我们自己做的web应用实现了相应接口，就可以调用Office Web Apps，从而实现文档的在线编辑查看。 在WOPI结构中，我们把存放Office文档的web应用叫WOPI Host或者WOPI Server。把查看编辑操作Office文档的web应用叫WOPI Client或者叫WOPI applications。所以，Office Web Apps充当的就是WOPI Client的角色。sharePoint，Exchange，自己开发的系统充当的就是WOPI Server的角色。

下图为浏览器，server，client三者的请求顺序及关系：

与office web app 集成，我们需要提供两个服务

• checkFileInfo服务
• getFile服务
  

  ---

下面看下这两个服务：

1. checkFileInfo 服务：此服务返回的是请求文件的基本信息，WOPI Server(我们自己的系统)以json方式返回给WOPI Client(office web apps)，服务的url格式为：

http://server/wopi/files/{filename}?access_token=token
如下示例：
http://localhost:8080/MyOWA/wopi/files/test.docx?access_token=token
这里的filename是你需要预览的文件名称，access_token是WOPI Client请求WOPI Server 时自动加上的。访问成功返回如下json数据格式:
` {
“AllowExternalMarketplace”: true,
“AllowOAuthOverHttp”: true,
“BaseFileName”: “hello.docx”,//文件名
“OwnerId”: “admin”,//文件所有者的唯一编号
“SHA256”: “0e258391262b515b878a8d0ccb78784ad3223ce219287e7df9b3f03c0c457ee9”,
“Size”: 11644,//文件大小，以bytes为单位
“Version”: 1477191374718//文件版本号，文件如果被编辑，版本号也要跟着改变
}
““
Json中至少要包括五个属性：BaseFileName, OwnerId, Size, SHA256, 和 Version,
点击查看更多参数说明

2. GetFile服务：此服务返回的是请求文件的内容，WOPI Server以数据流的方式返回给WOPI Client.服务URl格式一般为

http://server/wopi/files/{filename}/contents?access_token=token
如下示例：
http://localhost:8080/MyOWA/wopi/files/test.docx/contents?access_token=token

package cn.com.officeWebApp.controller;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.URLEncoder;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import com.alibaba.fastjson.JSON;

import cn.com.instai.officeWebApp.helper.SHA256Util;
import cn.com.instai.officeWebApp.model.FileModel;
import cn.com.instai.officeWebApp.model.OWAModel;

@Controller
@RequestMapping(value = "wopi")
public class OWAController {

    private static final Logger logger = Logger.getLogger(OWAController.class);

    public static final String OWA_XML = "http://192.168.1.60/hosting/discovery";

    /**
     * 获取文件信息
     * @Description 
     * @author niepei
     * @param request
     * @param response
     * @param filename
     * @param access_token
     * @return
     * @throws Exception
     */
    @SuppressWarnings({ "deprecation" })
    @RequestMapping(value = "files/{filename}", method = RequestMethod.GET)
    public  ModelAndView checkFileInfo(HttpServletRequest request, HttpServletResponse response,@PathVariable("filename") String filename/*, @RequestParam("access_token") String access_token*/)throws Exception {
        logger.debug("------------------------------->  checkFileInfo  has   end  ");
        String jsonStr = null;
        OWAModel model = new OWAModel();
        String reqUrl = request.getRequestURL().toString();
        filename = reqUrl.substring(reqUrl.lastIndexOf("/"));
        String filePath = request.getRealPath("template/"+filename);
        logger.debug("------------------------------->  filePath  is " + filePath );
        File file = new File(filePath);
        if (file.exists()) {
            model.setBaseFileName(file.getName());
            model.setSize(file.length());
            model.setOwnerId("admin");
            model.setSHA256(SHA256Util.getFileSHA256(filePath));
            model.setVersion(file.lastModified());
            model.setAllowExternalMarketplace(true);
            model.setAllowOAuthOverHttp(true);
        }
        jsonStr = JSON.toJSONString(model);
        PrintWriter out = response.getWriter();
        response.setCharacterEncoding("UTF-8"); 
        response.setContentType("application/json;charset=UTF-8");
        out.write(jsonStr);
        logger.debug("------------------------------->  checkFileInfo has   end  ");
        return null;

    }


    /**
     * 获取文件流
     * @Description 
     * @author niepei
     * @param request
     * @param response
     * @param filename
     * @param access_token
     * @return
     * @throws IOException
     */
    @SuppressWarnings("deprecation")
    @RequestMapping(value = "files/{filename}/contents", method = RequestMethod.GET)
    public HttpServletResponse  getFile(HttpServletRequest request, HttpServletResponse response,@PathVariable("filename") String filename/*, @RequestParam("access_token") String access_token*/)throws IOException {
        logger.debug("------------------------------->  getFile   has  begin");
        filename = request.getRealPath("template/"+filename);
        File file = new File(filename);
        String name = file.getName();
        InputStream is = new BufferedInputStream(new FileInputStream(filename));
        byte[] buffer = new byte[is.available()];
        is.read(buffer);
        is.close();
        response.reset();
        // 设置response的Header
        response.addHeader("Content-Disposition","attachment;filename=" + new String(name.getBytes("utf-8"), "ISO-8859-1"));
        response.addHeader("Content-Length", "" + file.length());
        response.setContentType("application/octet-stream");
        OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
        toClient.write(buffer);
        toClient.flush();
        toClient.close();
        logger.debug("------------------------------->  getFile   has   end  ");
        return response;

    }


    @SuppressWarnings("deprecation")
    @RequestMapping(value="test",method = RequestMethod.POST)
    public ModelAndView test(@RequestBody FileModel file){
        logger.debug("------------------------------->  test  has   end  ");
        String URL = "";
        String filename = file.getFilename();
        String ext = filename.substring(filename.lastIndexOf("."));
        if(ext.indexOf("do")>0){
            URL = "http://officewebapps.instai.cn/wv/wordviewerframe.aspx?WOPISrc=FILE_PATH";
        }else if(ext.indexOf("xl")>0){
            URL = "http://officewebapps.instai.cn/x/_layouts/xlviewerinternal.aspx?WOPISrc=FILE_PATH";
        }else if(ext.indexOf("pp")>0){
            URL = "http://officewebapps.instai.cn/p/PowerPointFrame.aspx?WOPISrc=FILE_PATH";
        }
        String filePath = URLEncoder.encode("http://localhost:8080/InstaiEduAi/wopi/files/"+filename);
        URL = URL.replace("FILE_PATH", filePath);
        logger.debug("URL ------------------> " + URL);
        ModelAndView mav = new ModelAndView("redirect:" + URL);
        logger.debug("------------------------------->  test  has   end  ");
        return mav;     
    }

}