Springboot动态生成网站地图sitemap教程

发现自从换了一套博客程序后，之前搜索引擎抓取的链接都失效了，所以才有此想法采用java生成动态的网站地图。
#  步骤一  创建实体
> SiteMapVo

```java
package com.my.blog.website.modal.Vo;

import com.my.blog.website.utils.SiteMapUtils;
import org.thymeleaf.util.DateUtils;

import java.util.Date;
import java.util.Locale;

/**
 * @author Jesse-liu
 * @description: 网站地图entity
 * @date 2020/5/7 9:09
 */
public class SiteMapVo {
    /**
     * url https://www.xxx.com
     */
    private String loc;
    /**
     * 最后更新时间 yyyy-MM-dd
     */
    private Date lastmod;
    /**
     * 更新速度 always hourly daily weekly monthly yearly never
     */
    private String changefreq;
    /**
     * 权重 1.0 0.9 0.8
     */
    private String priority;

public String getLoc() {
        return loc;
    }

public void setLoc(String loc) {
        this.loc = loc;
    }

public Date getLastmod() {
        return lastmod;
    }

public void setLastmod(Date lastmod) {
        this.lastmod = lastmod;
    }

public String getChangefreq() {
        return changefreq;
    }

public void setChangefreq(String changefreq) {
        this.changefreq = changefreq;
    }

public String getPriority() {
        return priority;
    }

public void setPriority(String priority) {
        this.priority = priority;
    }

public SiteMapVo() {

}

public SiteMapVo(String loc) {
        this.loc = loc;
        this.lastmod = new Date();
        this.changefreq = SiteMapUtils.CHANGEFREQ_ALWAYS;
        this.priority = "1.0";
    }

public SiteMapVo(String loc, Date lastmod, String changefreq, String priority) {
        this.loc = loc;
        this.lastmod = lastmod;
        this.changefreq = changefreq;
        this.priority = priority;
    }

@Override
    /** 重写 toString 适应xml格式 */
    public String toString() {
        StringBuffer sb = new StringBuffer();
        sb.append("<url>");
        sb.append("<loc>" + loc + "</loc>");
        sb.append("<lastmod>" + DateUtils.format(lastmod, "yyyy-MM-dd", Locale.SIMPLIFIED_CHINESE) + "</lastmod>");
        sb.append("<changefreq>" + changefreq + "</changefreq>");
        sb.append("<priority>" + priority + "</priority>");
        sb.append("</url>");
        return sb.toString();
    }
}

```

# 步骤二 创建工具类
> SiteMapUtils

```java
package com.my.blog.website.utils;

import com.my.blog.website.constant.WebConst;
import com.my.blog.website.modal.Vo.ContentVo;
import com.my.blog.website.modal.Vo.SiteMapVo;
import com.my.blog.website.service.IContentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.List;

/**
 * @author Jesse-liu
 * @description: java生成sitemap网站地图工具类
 * @date 2020/5/7 10:25
 */
@Component
public class SiteMapUtils {

public final static String BEGIN_DOC = "<urlset xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\">";
    public final static String END_DOC = "</urlset>";
    public final static String CHANGEFREQ_ALWAYS = "always";
    public final static String CHANGEFREQ_HOURLY = "hourly";
    public final static String CHANGEFREQ_DAILY = "daily";
    public final static String CHANGEFREQ_WEEKLY = "weekly";
    public final static String CHANGEFREQ_MONTHLY = "monthly";
    public final static String CHANGEFREQ_YEARLY = "yearly";
    public final static String CHANGEFREQ_NEVER = "never";

@Autowired
    private IContentService contentsService;

public String getBlogSiteMap() {
        StringBuffer sb = new StringBuffer();
        sb.append(BEGIN_DOC);
        sb.append(new SiteMapVo(WebConst.initConfig.get("site_url")));
        List<ContentVo> contentList = contentsService.findContentList();
        contentList.forEach(entity -> {
            sb.append(new SiteMapVo(Commons.permalink(entity), DateKit.dateFormat(Commons.fmtdate(entity.getModified(), "yyyy-MM-dd"), "yyyy-MM-dd"), CHANGEFREQ_MONTHLY, "0.9"));
        });
        sb.append(END_DOC);
        return sb.toString();
    }

public String getBzSiteMap() {
        StringBuffer sb = new StringBuffer();
        sb.append(BEGIN_DOC);
        sb.append(new SiteMapVo(WebConst.initConfig.get("site_url")));
        sb.append(END_DOC);
        return sb.toString();
    }
}

```
# 步骤三 
> Web层添加请求控制器

```java
  /**
     * @return : java.lang.String
     * @author Jesse-liu
     * @date 2020/5/7
     * @description: 动态生成网站地图sitemap
     **/
    @GetMapping(value = {"sitemap.xml", "sitemap"})
    public void getSiteMap(HttpServletResponse response) throws IOException {
        response.setCharacterEncoding("UTF-8");
        response.setContentType(MediaType.APPLICATION_XML_VALUE);
        response.getWriter().append(siteMapUtils.getBlogSiteMap());
    }
```

完美收工！！!

# 效果展示页面  
 [https://ooolo.net/sitemap.xml](https://ooolo.net/sitemap.xml)

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