SSM项目中实现图片上传和回显

在ssm项目中实现图片上传并回显
在前端页面通过选择内存中图片，提交后将图片存在对应的路径中，路径存进数据库，查询数据库返回的路径通过在jsp中用img src=“”来展示图片。
实体层：

package com.po;

import org.springframework.web.multipart.MultipartFile;

public class Choice {
    int qid;
    String year;
    String type;
    String topic;
    String image;
    String opt;
    String answer;
    String remark;
    private MultipartFile logoImage;

    public Choice() {
        super();
    }

    public Choice(int qid, String year, String type, String topic, String image, String opt, String answer, String remark, MultipartFile logoImage) {
        this.qid = qid;
        this.year = year;
        this.type = type;
        this.topic = topic;
        this.image = image;
        this.opt = opt;
        this.answer = answer;
        this.remark = remark;
        this.logoImage = logoImage;
    }

    public int getQid() {
        return qid;
    }

    public void setQid(int qid) {
        this.qid = qid;
    }

    public String getYear() {
        return year;
    }

    public void setYear(String year) {
        this.year = year;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getTopic() {
        return topic;
    }

    public void setTopic(String topic) {
        this.topic = topic;
    }

    public String getImage() {
        return image;
    }

    public void setImage(String image) {
        this.image = image;
    }

    public String getOpt() {
        return opt;
    }

    public void setOpt(String opt) {
        this.opt = opt;
    }

    public String getAnswer() {
        return answer;
    }

    public void setAnswer(String answer) {
        this.answer = answer;
    }

    public String getRemark() {
        return remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }

    public MultipartFile getLogoImage() {
        return logoImage;
    }

    public void setLogoImage(MultipartFile logoImage) {
        this.logoImage = logoImage;
    }

    @Override
    public String toString() {
        return "Choice{" +
                "qid=" + qid +
                ", year='" + year + '\'' +
                ", type='" + type + '\'' +
                ", topic='" + topic + '\'' +
                ", image='" + image + '\'' +
                ", opt='" + opt + '\'' +
                ", answer='" + answer + '\'' +
                ", remark='" + remark + '\'' +
                ", logoImage=" + logoImage +
                '}';
    }
}

Dao层

void insertChoice(Choice choice);

xml

        insert into Choice(year,type,topic,image,opt,answer,remark)
        values(#{year},#{type},#{topic},#{image},#{opt},#{answer},#{remark});
    

service层接口

public String addChoice(Choice choice,HttpServletRequest request);

@Override
    public String addChoice(Choice choice, HttpServletRequest request) {
        String newFileName = "";
        String fileName = choice.getLogoImage().getOriginalFilename();
        //选择了文件
        if(fileName.length() > 0){
            String realpath = request.getServletContext().getRealPath("/image");
            //实现文件上传
            String fileType = fileName.substring(fileName.lastIndexOf('.'));
            //防止文件名重名
            newFileName = MyUtil.getStringID() + fileType;
            choice.setImage("/image/"+newFileName);
            File targetFile = new File(realpath, newFileName);
            if(!targetFile.exists()){
                targetFile.mkdirs();
            }
            //上传
            try {
                choice.getLogoImage().transferTo(targetFile);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        //保存到数据库中
        cMapper.insertChoice(choice);
        return "choice/choicelist";

    }

控制层

@RequestMapping("/choicepreinsert")
    public String chiocePreinsert(){
        return "choice/choiceadd";
    }

在实现过程也是出现了不少问题，所以要注意细节