在SpringMVC中查看pdf文件中的文件内容（不可读）

我已经完成了使用spring MultipartFile将文件上传到我的目标文件夹的工作，现在我希望在单击查看按钮时以pdf格式查看相同的文件

这是我的jsp

<form method="POST" action="fileSearch">

        <table id="abc1" cellpadding="9" bgcolor="74BAAC" width="50%"
            style="margin-top: 8px; margin-left: 320px;" cellspacing="9">
            <tr>

                <td>Name:</td>
                <td><input type="text" name="name"></td>
                <td>Category:</td>
                <td><select name="seldCategory" id="selectFileCategory">
                        <option value="selectFileCategory">selectFileCategory</option>
                        <option value="FileCategory1">FileCategory1</option>
                        <option value="FileCategory2">FileCategory2</option>
                        <option value="FileCategory3">FileCategory3</option>
                        <option value="FileCategory4">FileCategory4</option>
                </select></td>
                <td><input type="submit" value="search"></td>
            </tr>


        </table>
        <c:if test='${not empty "${fileSearchList}"}'>

            <table align="center" class="viewAllTripTable" border="1"
                style="display: center">
                <c:if test='${not empty "${fileSearchList}"}'>
                    <tr>
                        <td colspan="1"><b>Name:</b></td>
                        <td colspan="1"><b>Category:</b></td>
                        <td colspan="1"><b>View File</b></td>
                    </tr>
                </c:if>
                <c:forEach items="${fileSearchList}" var="fsList">
                    <tr>
                        <td><c:out value="${fsList.name}" /></td>
                        <td><c:out value="${fsList.category}" /></td>
                        <td><c:out value="${fsList.file_path}" /></td>

                        <td><a class="buy" href="view?file_path=${fsList.file_path}&file_name=${fsList.name}">view</a></td>
                    </tr>
                </c:forEach>

            </table>

        </c:if>
    </form>

---

您可以尝试使用以下方法之一

使用AbstractITextPdfView构建PDF并返回它。那里 是否需要一些配置。你可以根据这个例子即兴创作 显示在

或者您可以尝试以下方法：

将方法签名更改为返回ResponseEntity和 进行以下其他更改：

    @RequestMapping(value = { "/view" }, method = RequestMethod.GET)
    public ResponseEntity<byte[]> viewFile(@RequestParam("file_path") String file_path,
                @RequestParam("file_name") String fileName,
                HttpServletResponse response, HttpServletRequest request)
                throws IOException, DocumentException {

        byte[] fileContents = // retrieve the file contents

        HttpHeaders httpHeaders = new HttpHeaders();
        httpHeaders.setContentType(MediaType.parseMediaType("application/pdf"));
        String fileName= "yourReqdFileName.pdf";
        httpHeaders.setContentDispositionFormData(fileName, fileName);
        httpHeaders.setCacheControl("must-revalidate, post-check=0, pre-check=0");
        ResponseEntity<byte[]> serverResponse = new ResponseEntity<byte[]>(contents, headers, HttpStatus.OK);
        return serverResponse;
    } 

---

Hi-Pramod根据您的建议，我尝试使用以下代码。Hi-Pramod我的要求是上传扫描的文档，并在单击查看按钮时下载相同的文档。按照你的建议，我试着用你发布的代码。当我打开pdf文档时，它显示无法加载它。请检查您生成的文档是否正确。生成后，尝试将其保存在磁盘上，然后直接打开。是的，现在它可以工作了。但是pdf文件不会自动打开。提前感谢。java.lang.IllegalArgumentException:org.springframework.util.Assert.notNullAssert.java:112上的未知返回值类型[[B]

    @RequestMapping(value = { "/view" }, method = RequestMethod.GET)
    public ResponseEntity<byte[]> viewFile(@RequestParam("file_path") String file_path,
                @RequestParam("file_name") String fileName,
                HttpServletResponse response, HttpServletRequest request)
                throws IOException, DocumentException {

        byte[] fileContents = // retrieve the file contents

        HttpHeaders httpHeaders = new HttpHeaders();
        httpHeaders.setContentType(MediaType.parseMediaType("application/pdf"));
        String fileName= "yourReqdFileName.pdf";
        httpHeaders.setContentDispositionFormData(fileName, fileName);
        httpHeaders.setCacheControl("must-revalidate, post-check=0, pre-check=0");
        ResponseEntity<byte[]> serverResponse = new ResponseEntity<byte[]>(contents, headers, HttpStatus.OK);
        return serverResponse;
    }