springMVC 简单的文件上传 （图片或者文件）
<code> 这是controller层 </code>
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
/**
* 图片上传
* @param files 传递过来的文件属性名称
* @param request
* @param model
* @return
* @throws IOException
*/
@ResponseBody
@RequestMapping( value="/threeFile",method = { RequestMethod.POST,RequestMethod.GET } )
public String threeFileUpload( @RequestParam("files")CommonsMultipartFile files[],
HttpServletRequest request) {
List<Map<String, Object>> resultList = new ArrayList<>();
Map<String, Object> resultMap = new HashMap<String, Object>();
// 验证文件是否相应的格式
for (int i = 0; i < files.length; i++) {
String fileName = files[i].getFileItem().getName();
String prefix=fileName.substring(fileName.lastIndexOf(".")+1);
logger.info("--文件后缀为 : "+prefix);
if (!TollUtil.pictureFormat(prefix)) {
resultMap.put("error", "图片上传失败");
resultList.add(resultMap);
return JSON.toJSONString(resultList);
}
}
List<String> list = new ArrayList<String>();
// 获得项目的路径
String path = TollUtil.getProject(request);
logger.info("path : "+path);
/*ServletContext sc = TollUtil.getProjects(request);
// 上传位置 设定文件保存的目录
String path1 = sc.getRealPath(""); //获取文件保存的目录
logger.info("winfows path1:"+path1);*/
String filePath = ""; //文件保存的目录
logger.info("当前系统为： "+TollUtil.osName());
// 因为Linux / 不需要转义 Windows需要转义
if (TollUtil.osName().trim().endsWith("Linux")) {
filePath = path.substring(0,path.lastIndexOf("/"));
} else {
filePath = path.substring(0,path.lastIndexOf("\\"));
}
String imgsFilePath = ConstantsUtil.imgsFilePath(filePath);
list = FilesUtil.uploadFile(request,files,imgsFilePath);
logger.info(list+"----------------");
if (list.isEmpty()) {
resultMap.put("error", "图片上传失败");
} else {
resultMap.put("sessus", list);
}
resultList.add(resultMap);
return JSON.toJSONString(resultList);
}
对应工具类 ，这里面所需要包都是jdk的
public class ToUtil {
/**
* 验证图片后缀格式
* @param suffixName
* @return
*/
public static boolean pictureFormat (String suffixName){
if ("PNG".equalsIgnoreCase(suffixName) || "jpg".equalsIgnoreCase(suffixName)
|| "jpeg".equalsIgnoreCase(suffixName) || "jpe".equalsIgnoreCase(suffixName) ||
"gif".equalsIgnoreCase(suffixName)) {
return true;
}
return false;
}
/**
* 获取操作系统名称
* @return
*/
public static String osName (){
return ConstantsUtil.OS_NAME;
}
/**
* 生成去除-的uuid
* @return
*/
public static String randUUID (){
return System.currentTimeMillis()+UUID.randomUUID().toString().replace("-", "");
}
/**
* 获取项目路径 1
* @param request
* @return
*/
public static String getProject(HttpServletRequest request){
return request.getSession().getServletContext().getRealPath("");
}
/**
* 获取项目路径
* @param request
* @return
*/
public static ServletContext getProjects (HttpServletRequest request){
ServletContext sc = request.getSession().getServletContext();
return sc;
}
}
通用工具类 这里面所需要包都是jdk的
public class ConstantsUtil {
//获取操作系统名称
public static final String OS_NAME = System.getProperties().getProperty("os.name");
/**
* 返回图片显示地址
* @param fileName
* @return
*/
public static String showImgsPath (String fileName){
StringBuffer sbf = new StringBuffer();
sbf.append("localhost:8080");
sbf.append("/");
sbf.append("uploadimgs");
sbf.append("/");
sbf.append(fileName);
return sbf.toString();
}
}
文件上传工具
public class FilesUtil {
/**
* 文件上传
* @param request
* @param files 文件
* @param path 文件保存的文件夹
* @return
*/
public static List<String> uploadFile (HttpServletRequest request,
CommonsMultipartFile files[],String path) {
List<String> list = new LinkedList<>();
//读取上传文件的地址
File f = new File(path);
if (!f.exists()){
f.mkdirs();
}
//图片保存的地址
String showFilePath = "";
String filePath = "";
FileOutputStream out = null;
InputStream in = null;
for (int i = 0; i < files.length; i++) {
// 获得原始文件名
String fileName = files[i].getOriginalFilename();
logger.info("第 "+i+" 张原始文件名" + fileName);
// 新文件名 加上下划线可以下载时截取原文件名称
String newFileName = TollUtil.randUUID() + "_" + fileName;
if (!files[i].isEmpty()) {
try {
filePath = path + newFileName;
out = new FileOutputStream(filePath);
in = files[i].getInputStream();
byte buffer[] = new byte[1024];
int b = 0;
// new MultipartListenerResolver().parseRequest(request);
while ((b = in.read(buffer)) > 0) {
out.write(buffer, 0, b);
}
showFilePath = ConstantsUtil.showImgsPath(newFileName); // 显示图片访问url 路径
list.add(showFilePath);
} catch (Exception e) {
e.printStackTrace();
} finally {
closeUploadIO(out,in);
}
}
}
return list;
}
/**
* 关闭流
* @param fos
* @param in
*/
public static void closeUploadIO(FileOutputStream out,InputStream in){
if (out != null){
try {
out.close();
} catch (IOException e) {
logger.error("FileOutputStream 关闭异常 "+e.getMessage());
}
}
if (in != null) {
try {
in.close();
} catch (IOException e) {
logger.error("InputStream 关闭异常 "+e.getMessage());
}
}
}
}
前端页面
<form action="/project/threeFile.do" method="post" enctype="multipart/form-data">
<input type="file" multiple="multiple" name="files">
<input type="submit" value="上传">
</form>
spring.xml 配置
<!-- spring mvc做上传图片，文件小于10k就不生成临时文件了 -->
<!-- 文件上传 -->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- maximum file size 40M -->
<property name="maxUploadSize" value="409600000" />
<!-- 设置在文件上传时允许写到内存中的最大值，以字节为单位计算，默认是10240 -->
<!-- 但是经实验，上传文件大小若小于此参数，则不会生成临时文件，很尴尬，故改为1 -->
<property name="maxInMemorySize" value="1" />
<property name="defaultEncoding" value="UTF-8" />
<!-- 处理上传文件的大小异常 为true -->
<property name="resolveLazily" value="true"/>
</bean>
jar包
gradle
//文件上传相关jar
// https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload
compile group: 'commons-fileupload', name: 'commons-fileupload', version: '1.3.1'
// https://mvnrepository.com/artifact/commons-io/commons-io
compile group: 'commons-io', name: 'commons-io', version: '2.4'
maven
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.0.1</version>
</dependency>
