Java爬虫之Jsoup爬Html网页链接

1. maven的pom.xml文件中引入Jsoup的sdk

        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
            <version>1.14.3</version>
        </dependency>

2. 直接写具体的爬虫方法

Controller层

 /**
     * 插件导入
     * https://api.oioweb.cn  该网站
     */
    @PostMapping(value = "/importPlugins")
    @ApiOperation(value = "插件导入", notes = "获取插件的详细请求信息")
    public R<Map<String, Object>> importPlugins(@RequestBody CrawlerDto crawlerDto) {
        return R.ok(wdPluginsService.importPlugins(crawlerDto.getUrl()));
    }

Service层 

Map<String, Object> importPlugins(String url);

ServiceImpl实现类

    @Override
    public Map<String, Object> importPlugins(String url){
        Map<String, Object> returnMap = new HashMap<>();
        // 教书先生api
        if(url.contains("api.oioweb.cn/doc")){
            returnMap = getUrlInfoByTeachMan(url);
        }
       return returnMap;
    }
 
    private Map<String, Object> getUrlInfoByTeachMan(String url){
        Map<String, Object> returnMap = new HashMap<>();
        try {
            Document document = Jsoup.connect(url).get();
            // 获取表头基础信息
            Elements fieldset = document.select("fieldset");
            Elements blockquote = document.select("blockquote");
            returnMap.put("title", fieldset.get(0).text());
            returnMap.put("describe", blockquote.get(0).text());
            // 定位到class为"layui-tab-item layui-show"的div元素
            Elements divElements = document.select("div.layui-tab-item.layui-show");// 根据实际情况修改选择器
            if (divElements != null) {
                Elements pElements = divElements.select("p.simpleTable");
                String faceUrl = pElements.get(0).text();
                String returnFomat = pElements.get(1).text();
                String method = pElements.get(2).text();
                String reExample = pElements.get(3).text();
                returnMap.put("faceUrl", faceUrl.substring(faceUrl.indexOf("：", 1) + 1));
                returnMap.put("returnFomat", returnFomat.substring(returnFomat.indexOf("： ") + 1));
                returnMap.put("method", method.substring(method.indexOf("： ") + 1));
                returnMap.put("reExample", reExample.substring(reExample.indexOf("：", 1) + 1));
 
 
                // 获取该div元素下的所有子元素
                for (Element div : divElements) {
                    // 这里可以添加您想要对每个div执行的操作
                    Elements tableElements = div.select("table");
                    Elements thead = tableElements.select("thead");
                    // 请求参数头
                    Elements headThs = thead.get(0).select("th");
                    List<String> requestHeaders = new ArrayList<>();
                    for (Element th : headThs) {
                        requestHeaders.add(th.text());
                    }
                    // 参数头
                    Elements bodyThs = thead.get(1).select("th");
                    List<String> responseHeaders = new ArrayList<>();
                    for (Element th : bodyThs) {
                        responseHeaders.add(th.text());
                    }
 
                    Elements tbody = tableElements.select("tbody");
                    Elements trs = tbody.select("tr");
                    List<Map<String, String>> reqList = new ArrayList<>();
                    List<Map<String, String>> resList = new ArrayList<>();
                    for (Element tr : trs) {
                        Elements tds = tr.select("td");
                        if (tds.size() == 4) { // 请求参数处理
                            Map<String, String> reqData = new HashMap<>();
                            for (int i = 0; i < requestHeaders.size(); i++) {
                                reqData.put(requestHeaders.get(i), tds.get(i).text());
                            }
                            reqList.add(reqData);
 
                        } else {   // size()为3则是返回参数处理
                            Map<String, String> resData = new HashMap<>();
                            for (int i = 0; i < responseHeaders.size(); i++) {
                                resData.put(responseHeaders.get(i), tds.get(i).text());
                            }
                            resList.add(resData);
 
                        }
 
                    }
                    returnMap.put("requestList", reqList);
                    returnMap.put("responseList", resList);
                    System.out.println(returnMap);
                }
            }
        }catch (IOException e){
            e.printStackTrace();
        }
        return returnMap;
    }

3. 总结 ：Java爬虫是根据某个网站的固定同一个页面批量爬取想获取的相关信息

如有建议，欢迎指教！