ajax实现图片上传
我的Servlet代码如下：
package indexServlet;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.net.URLDecoder;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import sun.misc.BASE64Decoder;
import net.sf.json.JSONObject;
import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;
@WebServlet("/CarousePicServlet")
public class CarousePicServlet extends HttpServlet {
public CarousePicServlet() {
super();
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
try {
String method = request.getParameter("method");
if (method != null) {
if (method.equals("uploadImg")) {
this.uploadImg(request,response);
}else if (method.equals("deleteImg")) {
this.deleteImg(request, response);
}
}else {//当不能从request中直接获取到数据的时候需要从流中读取
try {
BufferedReader br = request.getReader();
String line = null;
StringBuffer sb = new StringBuffer();
while((line = br.readLine())!=null){
sb.append(line);
}
String params = sb.toString();
if(params.contains("method")){
request.setAttribute("params", params);
if (params.contains("uploadImg")){
this.uploadImg(request,response);
} else if (params.contains("deleteImg")){
this.deleteImg(request, response);
}
return;
} else {
response.getWriter().print("missing parameter 'method'!");
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
response.getWriter().close();
} catch (Exception e) {}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 上传图片
* @param request
76 * @param response
77 */
private void uploadImg(HttpServletRequest request,HttpServletResponse response) {
try {
System.out.println("=================《《图片开始上传》》===================");
response.setContentType("text/html;charset=utf-8");
String imgFile = request.getParameter("imgFile");
String imgName = request.getParameter("imgName");
//request中没获取到参数时的处理
if (imgFile == null || imgName == null ) {
String params = (String)request.getAttribute("params");
if (params != null && imgFile == null && params.indexOf("imgFile=") != -1){
imgFile = params.substring(params.indexOf("imgFile=") + "imgFile=".length(), params.indexOf("&imgName="));
}else {
System.out.println("imgFile参数错误");
response.getWriter().print(JSONObject.fromObject("{'state':'error','msg':'imgFile参数错误'}").toString());
return;
}
if (params != null && imgName == null && params.indexOf("imgName=") != -1) {
imgName = params.substring(params.indexOf("imgName=") + "imgName=".length());
}else {
System.out.println("imgName参数错误");
response.getWriter().print(JSONObject.fromObject("{'state':'error','msg':'imgName参数错误'}").toString());
return;
}
}
//对参数为空进行判断
if ("".endsWith(imgFile.trim()) || "".endsWith(imgName.trim())) {
System.out.println("参数为空");
response.getWriter().print(JSONObject.fromObject("{'state':'error','msg':'参数为空'}").toString());
return;
}
imgName = URLDecoder.decode(imgName,"utf-8");//前面进行了两次编码，这里需要用解码器解码一次
//String path = "/site/images"+File.separator+imgName;//Linux文件保存路径
String path = "F:\\site\\images"+File.separator+imgName;//Windows文件保存路径
//File file = new File("/site/images");
File file = new File("F:\\site\\images");
if(!file.exists() && !file.isDirectory()){//如果文件夹不存在则创建
System.out.println("文件目录不存在，开始创建");
//file.mkdirs();//生成所有目录
//file.mkdir();//生成最后一层目录
if (!file.mkdirs()) {
System.out.println("文件目录创建失败");
response.getWriter().print(JSONObject.fromObject("{'state':'error','msg':'文件目录创建失败'}").toString());
return;
}
}
FileOutputStream os = new FileOutputStream(path);
imgFile = imgFile.replaceAll("#wb#", "+");
BASE64Decoder decoder = new BASE64Decoder();
byte[] b = decoder.decodeBuffer(imgFile);
for(int i=0;i< b.length;++i){
if(b[i]< 0){//调整异常数据
b[i]+=256;
}
}
InputStream is = new ByteArrayInputStream(b);
int len = 0;
while((len=is.read(b))!=-1){
os.write(b,0,len);
}
os.close();
is.close();
System.out.println("上传成功,文件保存在："+path);
response.getWriter().print(JSONObject.fromObject("{'state':'ok','msg':'上传成功'}").toString());
} catch (Exception e) {
e.printStackTrace();
try {
response.getWriter().print(JSONObject.fromObject("{'state':'error','msg':'"+e.getMessage()+"'}").toString());
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
/**
* 删除图片
* @param request
* @param response
*/
private void deleteImg(HttpServletRequest request,HttpServletResponse response) {
try {
System.out.println("=================《《图片开始删除》》===================");
String path = request.getParameter("path");
if (path == null || "".endsWith(path.trim())) {
System.out.println("path参数错误");
response.getWriter().print(JSONObject.fromObject("{'state':'error','msg':'path参数错误'}").toString());
return;
}
//删除文件
File file = new File(path);
//路径存在并且为文件则进行删除
if (file.exists() && file.isFile()) {
file.delete();
System.out.println("删除成功,文件路径："+path);
response.getWriter().print(JSONObject.fromObject("{'state':'ok','msg':'删除成功'}").toString());
}
} catch (Exception e) {
e.printStackTrace();
try {
response.getWriter().print(JSONObject.fromObject("{'state':'error','msg':'"+e.getMessage()+"'}").toString());
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
}