高级示例
自定义 Scorer
针对特定网站结构定制内容识别逻辑。完整实现请参考 测试与自定义扩展，以下展示核心用法：
go
package main
import (
"fmt"
"log"
"strings"
"github.com/cybergodev/html"
)
// 实现自定义 Scorer（完整示例见 guides/testing-custom）
type myScorer struct{}
func (s myScorer) Score(node html.ContentNode) int {
if node == nil {
return 0
}
class := node.AttrValue("class")
if strings.Contains(class, "article") || strings.Contains(class, "post") {
return 100
}
if strings.Contains(class, "sidebar") || strings.Contains(class, "comment") {
return -50
}
return 0
}
func (s myScorer) ShouldRemove(node html.ContentNode) bool {
switch node.Data() {
case "nav", "footer", "header":
return true
}
return false
}
func main() {
cfg := html.DefaultConfig()
cfg.Scorer = myScorer{}
p, err := html.New(cfg)
if err != nil {
log.Fatal(err)
}
defer p.Close()
data := []byte(`<html><body>
<nav><a href="/">首页</a></nav>
<article class="post-content">
<h1>深入理解 Go 并发</h1>
<p>goroutine 是 Go 的轻量级线程。</p>
</article>
<aside class="sidebar">推荐阅读</aside>
</body></html>`)
result, err := p.Extract(data)
if err != nil {
log.Fatal(err)
}
fmt.Println("正文：", result.Text)
// 正文：深入理解 Go 并发
//
// goroutine 是 Go 的轻量级线程。
}多 Sink 审计管道
构建分级审计管道：critical 事件写入独立文件，所有事件同时输出到日志。
go
package main
import (
"fmt"
"log"
"os"
"github.com/cybergodev/html"
)
func main() {
// 创建输出目标
allFile, _ := os.Create("audit-all.jsonl")
criticalFile, _ := os.Create("audit-critical.jsonl")
defer allFile.Close()
defer criticalFile.Close()
// 构建多层级管道
allSink := html.NewWriterAuditSink(allFile)
criticalSink := html.NewFilteredSink(
html.NewWriterAuditSink(criticalFile),
func(e html.AuditEntry) bool {
return e.Level == html.AuditLevelCritical
},
)
loggerSink := html.NewLoggerAuditSink()
pipeline := html.NewMultiSink(allSink, criticalSink, loggerSink)
// 配置
cfg := html.HighSecurityConfig()
cfg.Audit = html.HighSecurityAuditConfig()
cfg.Audit.Sink = pipeline
p, err := html.New(cfg)
if err != nil {
log.Fatal(err)
}
defer p.Close()
// 处理内容
data := []byte(`<html><body>
<script>alert('xss')</script>
<article><p>安全的内容</p></article>
</body></html>`)
result, err := p.Extract(data)
if err != nil {
log.Fatal(err)
}
fmt.Println("正文：", result.Text)
// 审计日志自动记录到文件和 stderr
}批量文件处理
批量处理目录下的 HTML 文件，收集结果和错误：
go
package main
import (
"fmt"
"os"
"path/filepath"
"github.com/cybergodev/html"
)
func main() {
// 收集文件路径
var files []string
filepath.Walk("./pages", func(path string, info os.FileInfo, err error) error {
if err != nil {
return nil
}
if filepath.Ext(path) == ".html" || filepath.Ext(path) == ".htm" {
files = append(files, path)
}
return nil
})
fmt.Printf("发现 %d 个文件\n", len(files))
// 批量处理
p, _ := html.New(html.TextOnlyConfig())
defer p.Close()
// 单批上限 10000；超出会整批失败，需调用方自行分批
batch := p.ExtractBatchFiles(files)
fmt.Printf("成功：%d, 失败：%d, 取消：%d\n",
batch.Success, batch.Failed, batch.Cancelled)
// 处理结果
for i, result := range batch.Results {
if result != nil {
fmt.Printf("[%d] %s (字数: %d)\n", i, result.Title, result.WordCount)
}
}
// 检查错误
for i, err := range batch.Errors {
if err != nil {
fmt.Printf("[%d] 错误: %v\n", i, err)
}
}
}带超时的 Processor 复用
Web 服务场景下的 Processor 单例模式：
go
package main
import (
"context"
"encoding/json"
"fmt"
"log"
"net/http"
"time"
"github.com/cybergodev/html"
)
var processor *html.Processor
func init() {
cfg := html.DefaultConfig()
cfg.MaxCacheEntries = 5000
cfg.CacheTTL = 30 * time.Minute
cfg.ProcessingTimeout = 10 * time.Second
var err error
processor, err = html.New(cfg)
if err != nil {
log.Fatal(err)
}
}
func extractHandler(w http.ResponseWriter, r *http.Request) {
ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
defer cancel()
data := []byte(r.FormValue("html"))
if len(data) == 0 {
http.Error(w, "html field required", http.StatusBadRequest)
return
}
result, err := processor.ExtractWithContext(ctx, data)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(result)
}
func statsHandler(w http.ResponseWriter, r *http.Request) {
stats := processor.GetStatistics()
fmt.Fprintf(w, "已处理：%d\n缓存命中：%d\n错误：%d\n",
stats.TotalProcessed, stats.CacheHits, stats.ErrorCount)
}
func main() {
defer processor.Close()
http.HandleFunc("/extract", extractHandler)
http.HandleFunc("/stats", statsHandler)
log.Fatal(http.ListenAndServe(":8080", nil))
}提取并生成 Markdown 文件
从 HTML 页面提取内容并保存为 Markdown 文件：
go
package main
import (
"fmt"
"log"
"os"
"strings"
"github.com/cybergodev/html"
)
func main() {
p, err := html.New(html.MarkdownConfig())
if err != nil {
log.Fatal(err)
}
defer p.Close()
urls := []string{
"downloaded/page1.html",
"downloaded/page2.html",
"downloaded/page3.html",
}
for _, path := range urls {
md, err := p.ExtractToMarkdownFromFile(path)
if err != nil {
log.Printf("处理 %s 失败: %v", path, err)
continue
}
// 生成输出文件名
outPath := strings.Replace(path, ".html", ".md", 1)
if err := os.WriteFile(outPath, []byte(md), 0644); err != nil {
log.Printf("写入 %s 失败: %v", outPath, err)
continue
}
fmt.Printf("✓ %s → %s\n", path, outPath)
}
}