struts2上传图片和显示图片
一、图片上传
1.在jsp页面中
<s:form action="company" method="post"enctype="multipart/form-data">
<s:file name="file" id="logo"></s:file>
<s:submit value="添加"/>
</s:form>
2.Action 中
public class CompanyAction extends ActionSupport {
CompanyService companyService;
private Pager pager=new Pager();
private Company company;
private File file;
private String fileFileName;
……
get、set方法
……
public String execute() throws Exception{
return add();
}
public String add() throws Exception{
if(file!=null){
addFile();
}
fpService.add(findPerson);
return "add";
}
public String addFile() throws Exception {
String o="";
if (file != null) {
if (this.getFileFileName() != null) {
try {
String mailTime = DateUtil
.mailDate(new java.util.Date());
company.setFp_logpath("upload/"
+ mailTime
+ "_"
+ "."
+ StringUtil.getExtension(this
.getFileFileName()));
InputStream is = new FileInputStream(file);
String root = ServletActionContext.getRequest()
.getRealPath("/upload");
File diskFile = new File(root, mailTime
+ "_"
+ "."
+ StringUtil.getExtension(this
.getFileFileName()));
OutputStream os = new FileOutputStream(diskFile);
byte[] buffer = new byte[8192];
int length = 0;
while ((length = is.read(buffer)) > 0) {
os.write(buffer, 0, length);
}
is.close();
os.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
return o;
}
}
3.CompanyServiceImpl
public class CompanyServiceImpl implements CompanyService {
public void add(Company company){
commonDao.add(company);
}
public Company get(int id){
return (Company )commonDao.get(Company.class, id);
}
public void update(Company fp){
commonDao.update(fp);
}
}
二、显示图片(view)
1.jsp页面
<s:form action="companyAction" method="post">
<img src="/<s:property value="company.logpath" /> " alt="企业logo" width="150px" height="50px"/>
</s:form>
2.Action中
与一般的view 方法相同
三、修改company换另一幅图片
1.Action 中首先调用get方法获得要修改的实体(与一般情况相同)
2.在jsp页面中
<s:form action="companyAction" method="post" enctype="multipart/form-data">
<s:if test="%{!company.logpath.equals('')}">
<s:hidden name="company.logpath"/>
</s:if>
<s:file name="file" id="file" ></s:file>
<s:submit value="修改"/>
</s:form>
3.在Action中，调用update方法
public String update()throws Exception{
HttpServletRequest request = ServletActionContext.getRequest();
Company company1=companyService.get(company.getId());
company.setLogpath("");
if(file!=null&&fileFileName!=null&&!fileFileName.equals("")){
addFile();
}else{
if(null!=company1.getLogpath()&&!company1.getLogpath().equals("")){
company.setLogpath(company1.getLogpath());
}
}
companyService.update(company);
return "update";
}
四、以上操作的共同条件
在webroot下建立upload包用来放置图片