Java性能优化实战技术文章大纲

性能优化的核心目标

提升系统吞吐量
降低响应延迟
减少资源消耗
提高系统稳定性

JVM层面优化

选择合适的垃圾收集器（G1、ZGC等）
调整堆内存大小（-Xms、-Xmx）
优化新生代与老年代比例（-XX:NewRatio）
设置合适的Survivor区比例（-XX:SurvivorRatio）
选择恰当的GC日志参数（-XX:+PrintGCDetails）

代码层面优化

避免创建不必要的对象
使用StringBuilder代替字符串拼接
合理使用集合类（ArrayList vs LinkedList）
优化循环结构
减少同步块范围

并发编程优化

使用线程池替代显式创建线程
选择合适的并发集合（ConcurrentHashMap）
避免死锁和资源竞争
使用原子类（AtomicInteger）
合理使用volatile和synchronized

数据库访问优化

使用连接池技术（HikariCP）
优化SQL查询语句
合理使用索引
批处理操作
缓存查询结果

缓存策略优化

本地缓存实现（Caffeine）
分布式缓存应用（Redis）
缓存失效策略
缓存穿透解决方案
缓存一致性保障

工具与监控

JProfiler性能分析
VisualVM监控工具
Arthas在线诊断
GC日志分析
性能基准测试（JMH）

实战案例分析

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