javaidea+ssm框架遇到的问题

0.学习教程

http://www.cnblogs.com/jiekzou/p/9205117.html

https://github.com/crossoverJie/SSM

1.gradle没刷新导致的jar包不能解析:

点击View->Tool Window->Gradle->点击面板里第一个按钮Refresh All.重新运行即可.

2.打开gradle构建的项目,import找到build.gradle文件确定.

 3.mybatis注解like(http://lavasoft.blog.51cto.com/62575/1386870/):

&＃64;Select("select * from girl where name like \"%\"#{name}\"%\"")
public List likeName(String name);

4.mybatis insert 返回id自增的值 

useGeneratedKeys&＃61;"true" keyProperty&＃61;"memberId" parameterType&＃61;"com.xxx.entity.Member">
　　insert into member (member_name,member_phone_no)values(#{memberName},#{memberPhoneNo})
 

5.idea使用git版本控制

菜单 vcs ->Enable Version Control Integration选择git

6.git提示非空目录:先在目录内执行git init命令

 7.eclipse: class path resource [applicationContext.xml] cannot be opened because it does not exist;

close项目,重新添加到eclipse,然后project->clean

20.java lambda linq

21.jsp和js数组互操作

22.多文件上传

第一种需要input的name和requestparam里的value设置一直

submit

&＃64;RequestMapping("/uploadFile")
public void uploadFile(&＃64;RequestParam(value &＃61; "uploadFiles") MultipartFile[] uploadFiles, HttpServletRequest request, HttpServletResponse response,
HttpSession session) {
JSONObject param &＃61; new JSONObject();

if (uploadFiles &＃61;&＃61; null || uploadFiles.length <&＃61; 0) {
param.put("token", false);
param.put("datas", null);
param.put("msg", "请选择文件.");
ServletUtil.write(response, param.toString());
return;
}

for (MultipartFile file : uploadFiles) {
String filename &＃61; file.getOriginalFilename();
String oriName &＃61; file.getOriginalFilename();
String extName &＃61; oriName.substring(oriName.lastIndexOf(".")).toUpperCase();
if (!extension.contains(extName)) {
param.put("token", false);
param.put("datas", null);
param.put("msg", "不支持的文件格式.仅支持:" &＃43; extension);
ServletUtil.write(response, param.toString());

}
String savePath&＃61;serverPath&＃43;"\\photo\\"&＃43;UUID.randomUUID()&＃43;"--"&＃43;filename;
file.transferTo(new File(savePath));//保存
}

}

 第二种 input的 name随便取

&＃64;RequestMapping("/uploadFile1")

public void uploadFile1(MultipartHttpServletRequest request, HttpServletResponse response, HttpSession session)throws IllegalStateException, IOException {

List uploadFiles &＃61; new ArrayList<>();
CommonsMultipartFile multipartFile &＃61; null;
Iterator itr &＃61; request.getFileNames();
while (itr.hasNext()) {
String str &＃61; itr.next();
multipartFile &＃61; (CommonsMultipartFile) request.getFile(str);
String fileName &＃61; multipartFile.getOriginalFilename(); // 原文件名
CommonsMultipartFile mpf &＃61; (CommonsMultipartFile) request.getFile(str);
mpf.transferTo(new File("c:\\upload\\"&＃43;fileName));
uploadFiles.add(mpf);
}

}

 23.ffmpeg将amr转mp3

(仅限window平台)将ffmpeg.exe放在webroot下

调用: ToMp3(request.getSession().getServletContext().getRealPath("/"), savePath);

https://blog.csdn.net/luqyu/article/details/43525795

/**
* 将上传的录音转为mp3格式
* &＃64;param webroot 项目的根目录
* &＃64;param sourcePath 文件的相对地址
*/
public static void ToMp3(String webroot, String sourcePath){
//File file &＃61; new File(sourcePath);
String targetPath &＃61; sourcePath&＃43;".mp3";//转换后文件的存储地址&＃xff0c;直接将原来的文件名后加mp3后缀名
Runtime run &＃61; null;
try {
run &＃61; Runtime.getRuntime();
long start&＃61;System.currentTimeMillis();
Process p&＃61;run.exec(webroot&＃43;"/ffmpeg -i "&＃43;sourcePath&＃43;" -acodec libmp3lame "&＃43; targetPath);//执行ffmpeg.exe,前面是ffmpeg.exe的地址&＃xff0c;中间是需要转换的文件地址&＃xff0c;后面是转换后的文件地址。-i是转换方式&＃xff0c;意思是可编码解码&＃xff0c;mp3编码方式采用的是libmp3lame
//释放进程
p.getOutputStream().close();
p.getInputStream().close();
p.getErrorStream().close();
p.waitFor();
long end&＃61;System.currentTimeMillis();
System.out.println(sourcePath&＃43;" convert success, costs:"&＃43;(end-start)&＃43;"ms");
//删除原来的文件
//if(file.exists()){
//file.delete();
//}
} catch (Exception e) {
e.printStackTrace();
}finally{
//run调用lame解码器最后释放内存
run.freeMemory();
}
}

(跨平台) http://www.sauronsoftware.it/projects/jave/download.php下载jave.jar导入

 http://mfan.iteye.com/blog/2032454

public static void changeToMp3(String sourcePath, String targetPath) {
File source &＃61; new File(sourcePath);
File target &＃61; new File(targetPath);
AudioAttributes audio &＃61; new AudioAttributes();
Encoder encoder &＃61; new Encoder();

audio.setCodec("libmp3lame");
EncodingAttributes attrs &＃61; new EncodingAttributes();
attrs.setFormat("mp3");
attrs.setAudioAttributes(audio);

try {
encoder.encode(source, target, attrs);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (InputFormatException e) {
e.printStackTrace();
} catch (EncoderException e) {
e.printStackTrace();
}
}

From:http://www.cnblogs.com/xuejianxiyang/p/7298303.html